[system] init: model claude-sonnet-5-5, Claude Code 2.1.312, permission mode dontAsk [system] status [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens 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[system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [assistant] I'll start by checking which tools this sandbox has, since that decides how I can test the build. [tool Bash] { "command": "pwd && ls -la && echo \"--- tools ---\" && for t in node npm python3 deno bun chromium google-chrome chrome firefox safaridriver playwright puppeteer; do printf \"%s: \" \"$t\"; (command -v \"$t\" || echo \"not found\"); done; echo \"--- apps ---\"; ls /Applications 2>&1 | head -40", "description": "Inspect working dir and available tools" } [tool error] Exit code 1 [workspace] total 0 drwx------@ 3 [redacted:username] wheel 96 Oct 28 13:16 . drwx------@ 5 [redacted:username] wheel 160 Oct 28 13:12 .. drwxr-xr-x@ 3 [redacted:username] wheel 96 Oct 28 13:16 .claude --- tools --- node: /opt/homebrew/opt/node@22/bin/node npm: /opt/homebrew/opt/node@22/bin/npm python3: /usr/bin/python3 deno: not found bun: not found chromium: not found google-chrome: not found chrome: not found firefox: not found safaridriver: /System/Cryptexes/App/usr/bin/safaridriver playwright: not found puppeteer: not found --- apps --- 1Password.app Blender.app ChatGPT.app Claude.app Clipboard Bridge.app CmdBot.app CmdBrief.app Cursor.app Discord.app GarageBand.app Ghostty.app Google Chrome.app Grok Bot.app Hearth.app iMovie.app iTerm.app Keynote.app Ledger Wallet.app Magnet.app Masterbuilt.app Microsoft Excel.app Microsoft Word.app Numbers.app OBS.app OrbStack.app Pages.app qdigidoc4.app Roblox.app RobloxStudio.app RustDesk.app Safari.app Scout.app Shotcut.app Snowman.app Steam.app Tailscale.app TestFlight.app Unity Unity Hub.app Utilities zsh:1: operation not permitted: [redacted:local-path] [system] status [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [assistant] Chrome is installed, so I may be able to test in a real browser. I'll check whether it runs headless inside the sandbox. [tool Bash] { "command": "echo \"TMPDIR=$TMPDIR\"; ls -la \"$TMPDIR\" 2>&1 | head; CHROME=\"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\"; ls -la \"$CHROME\" 2>&1; \"$CHROME\" --version 2>&1 | head -3; node --version", "description": "Check TMPDIR and Chrome version" } [system] task_started [system] task_notification [tool error] Exit code 134 TMPDIR=[redacted:local-path] ls: [redacted:local-path] Operation not permitted -rwxrwxr-x@ 1 [redacted:username] admin 367696 Oct 28 00:52 /Applications/Google Chrome.app/Contents/MacOS/Google Chrome Google Chrome 156.0.8078.73 ----- Native stack trace ----- 1: 0x10373a30c node::InitializeOncePerProcessInternal(std::__1::vector, std::__1::allocator>, std::__1::allocator, std::__1::allocator>>> const&, node::ProcessInitializationFlags::Flags) [/opt/homebrew/Cellar/node@22/22.23.4/lib/libnode.127.dylib] 2: 0x10373ae78 node::Start(int, char**) [/opt/homebrew/Cellar/node@22/22.23.4/lib/libnode.127.dylib] 3: 0x195eebe80 start [/usr/lib/dyld] [system] status [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [tool Bash] { "command": "node --version 2>&1 | head -20; echo \"exit: $?\"; echo ---; node -e \"console.log('hi', process.version)\" 2>&1 | head -20", "description": "Diagnose Node startup crash" } [tool error] Exit code 1 v22.23.4 exit: 0 --- hi v22.23.4 zsh:1: operation not permitted: [redacted:local-path] [system] status [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [system] thinking_tokens [assistant] Node works. Next I'll see whether headless Chrome can run here. I'll put the test profile and scripts in a scratch folder inside the working directory and delete it at the end. [tool Bash] { "command": "mkdir -p .t/profile && cat > .t/probe.html <<'EOF'\n
\n\nEOF\nCHROME=\"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\"\ntimeout 60 \"$CHROME\" --headless=new --no-sandbox --disable-gpu --user-data-dir=\"$PWD/.t/profile\" --window-size=390,844 --screenshot=\"$PWD/.t/probe.png\" \"file://$PWD/.t/probe.html\" 2>&1 | tail -15; ls -la .t",
  "description": "Try headless Chrome screenshot of probe page"
}

[tool error]
Exit code 1
(eval):1: can't create temp file for here document: operation not permitted
sandbox_extension_issue_file_to_process failed for /Applications/Google Chrome.app: 1 (Operation not permitted)
[1028/131713.987253:ERROR:third_party/crashpad/crashpad/util/mac/xattr.cc:41] getxattr size org.chromium.crashpad.database.initialized on file [redacted:user-path] Operation not permitted (1)
[1028/131713.988178:ERROR:third_party/crashpad/crashpad/util/mac/xattr.cc:41] getxattr size com.googlecode.crashpad.initialized on file [redacted:user-path] Operation not permitted (1)
[1028/131713.988197:ERROR:third_party/crashpad/crashpad/util/mac/xattr.cc:66] setxattr org.chromium.crashpad.database.initialized on file [redacted:user-path] Operation not permitted (1)
[1028/131713.988733:ERROR:third_party/crashpad/crashpad/util/file/file_io.cc:103] ReadExactly: expected 8, observed 0
[1028/131713.989223:ERROR:third_party/crashpad/crashpad/util/mac/xattr.cc:41] getxattr size org.chromium.crashpad.database.initialized on file [redacted:user-path] Operation not permitted (1)
[1028/131713.989277:ERROR:third_party/crashpad/crashpad/util/mac/xattr.cc:41] getxattr size com.googlecode.crashpad.initialized on file [redacted:user-path] Operation not permitted (1)
[1028/131713.989299:ERROR:third_party/crashpad/crashpad/util/mac/xattr.cc:66] setxattr org.chromium.crashpad.database.initialized on file [redacted:user-path] Operation not permitted (1)
[92421:18949427:1028/131713.998770:ERROR:chrome/browser/process_singleton_posix.cc:1046] Failed to create socket directory.
[92421:18949427:1028/131713.998890:ERROR:chrome/app/chrome_main_delegate.cc:624] Failed to create a ProcessSingleton for your profile directory. This means that running multiple instances would start multiple browser processes rather than opening a new window in the existing process. Aborting now to avoid profile corruption.
total 0
drwxr-xr-x@ 4 [redacted:username]  wheel  128 Oct 28 13:17 .
drwx------@ 4 [redacted:username]  wheel  128 Oct 28 13:17 ..
-rw-r--r--@ 1 [redacted:username]  wheel    0 Oct 28 13:17 probe.html
drwxr-xr-x@ 2 [redacted:username]  wheel   64 Oct 28 13:17 profile
zsh:12: operation not permitted: [redacted:local-path]

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[thinking]
Heredocs and Chrome both fail due to $TMPDIR permission issues, so I'll use the Write tool for the probe page and retry with TMPDIR pointed inside the working directory.

[tool Write]
{
  "file_path": "[workspace]/.t/probe.html",
  "content": "
\n\n"
}

[tool result]
File created successfully at: [workspace]/.t/probe.html (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "mkdir -p .t/tmp .t/profile && touch .t/tmp/w && echo \"wd-tmp writable\" ; touch \"$TMPDIR/x\" 2>&1 | head -2; echo \"TMPDIR touch exit: $?\"",
  "description": "Check which temp locations are writable"
}

[tool error]
Exit code 1
wd-tmp writable
touch: [redacted:local-path] Operation not permitted
TMPDIR touch exit: 0
zsh:1: operation not permitted: [redacted:local-path]

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[assistant]
`$TMPDIR` isn't writable in this session, but the working directory is. I'll retry Chrome with `TMPDIR` set to the scratch folder.

[tool Bash]
{
  "command": "export TMPDIR=\"$PWD/.t/tmp\"; CHROME=\"/Applications/Google Chrome.app/Contents/MacOS/Google Chrome\"\ntimeout 90 \"$CHROME\" --headless=new --no-sandbox --disable-gpu --disable-crash-reporter --disable-breakpad --no-first-run --user-data-dir=\"$PWD/.t/profile\" --window-size=390,844 --screenshot=\"$PWD/.t/probe.png\" \"file://$PWD/.t/probe.html\" 2>&1 | grep -v crashpad | tail -15; ls -la .t",
  "description": "Retry headless Chrome with TMPDIR in working dir"
}

[tool error]
Exit code 1
sandbox_extension_issue_file_to_process failed for /Applications/Google Chrome.app: 1 (Operation not permitted)
[95987:18955678:1028/131733.424984:ERROR:chrome/browser/process_singleton_posix.cc:1046] Failed to create socket directory.
[95987:18955678:1028/131733.425071:ERROR:chrome/app/chrome_main_delegate.cc:624] Failed to create a ProcessSingleton for your profile directory. This means that running multiple instances would start multiple browser processes rather than opening a new window in the existing process. Aborting now to avoid profile corruption.
total 8
drwxr-xr-x@ 5 [redacted:username]  wheel  160 Oct 28 13:17 .
drwx------@ 4 [redacted:username]  wheel  128 Oct 28 13:17 ..
-rw-r--r--@ 1 [redacted:username]  wheel  715 Oct 28 13:17 probe.html
drwxr-xr-x@ 2 [redacted:username]  wheel   64 Oct 28 13:17 profile
drwxr-xr-x@ 3 [redacted:username]  wheel   96 Oct 28 13:17 tmp
zsh:2: operation not permitted: [redacted:local-path]

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[assistant]
Chrome still can't create its singleton socket directory. I'll check whether a plain `mkdtemp` under this `TMPDIR` works in the sandbox.

[tool Bash]
{
  "command": "export TMPDIR=\"$PWD/.t/tmp\"; node -e \"\nconst fs=require('fs'),os=require('os');\nconsole.log('os.tmpdir =', os.tmpdir());\ntry{const d=fs.mkdtempSync(os.tmpdir()+'/.com.google.Chrome.');console.log('mkdtemp ok',d);fs.writeFileSync(d+'/x','1');console.log('write ok');fs.rmSync(d,{recursive:true});}catch(e){console.log('ERR',e.message)}\n\"; env | grep -i -E '^(TMPDIR|HOME|USER)=' ",
  "description": "Test mkdtemp under redirected TMPDIR"
}

[permission denied]
Bash: Permission to use Bash has been denied because Claude Code is running in don't ask mode. IMPORTANT: You *may* attempt to accomplish this action using other tools that might naturally be used to accomplish this goal, e.g. using head instead of cat. But you *should not* attempt to work around this denial in malicious ways, e.g. do not use your ability to run tests to execute non-test actions. You should only try to work around this restriction in reasonable ways that do not attempt to bypass the intent behind this denial. If you believe this capability is essential to complete the user's request, STOP and explain to the user what you were trying to do and why you need this permission. Let the user decide how to proceed.

[tool error]
Permission to use Bash has been denied because Claude Code is running in don't ask mode. IMPORTANT: You *may* attempt to accomplish this action using other tools that might naturally be used to accomplish this goal, e.g. using head instead of cat. But you *should not* attempt to work around this denial in malicious ways, e.g. do not use your ability to run tests to execute non-test actions. You should only try to work around this restriction in reasonable ways that do not attempt to bypass the intent behind this denial. If you believe this capability is essential to complete the user's request, STOP and explain to the user what you were trying to do and why you need this permission. Let the user decide how to proceed.

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[assistant]
That diagnostic was denied, so I'll stay away from recursive deletes and environment dumps and keep to simple read-only checks. First, what `TMPDIR` does Node see here?

[tool Bash]
{
  "command": "export TMPDIR=\"$PWD/.t/tmp\"; node -e \"console.log(require('os').tmpdir())\"",
  "description": "Print the temp dir Node resolves"
}

[permission denied]
Bash: Permission to use Bash has been denied because Claude Code is running in don't ask mode. IMPORTANT: You *may* attempt to accomplish this action using other tools that might naturally be used to accomplish this goal, e.g. using head instead of cat. But you *should not* attempt to work around this denial in malicious ways, e.g. do not use your ability to run tests to execute non-test actions. You should only try to work around this restriction in reasonable ways that do not attempt to bypass the intent behind this denial. If you believe this capability is essential to complete the user's request, STOP and explain to the user what you were trying to do and why you need this permission. Let the user decide how to proceed.

[tool error]
Permission to use Bash has been denied because Claude Code is running in don't ask mode. IMPORTANT: You *may* attempt to accomplish this action using other tools that might naturally be used to accomplish this goal, e.g. using head instead of cat. But you *should not* attempt to work around this denial in malicious ways, e.g. do not use your ability to run tests to execute non-test actions. You should only try to work around this restriction in reasonable ways that do not attempt to bypass the intent behind this denial. If you believe this capability is essential to complete the user's request, STOP and explain to the user what you were trying to do and why you need this permission. Let the user decide how to proceed.

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[assistant]
Even that trivial command was denied. I'll drop the Chrome path, since it's a testing aid that the sandbox keeps blocking, and check whether plain Node still runs for simulation tests.

[tool Bash]
{
  "command": "node -e \"console.log(1+1)\"",
  "description": "Check that plain Node still runs"
}

[tool error]
Exit code 134
----- Native stack trace -----

 1: 0x10722630c node::InitializeOncePerProcessInternal(std::__1::vector, std::__1::allocator>, std::__1::allocator, std::__1::allocator>>> const&, node::ProcessInitializationFlags::Flags) [/opt/homebrew/Cellar/node@22/22.23.4/lib/libnode.127.dylib]
 2: 0x107226e78 node::Start(int, char**) [/opt/homebrew/Cellar/node@22/22.23.4/lib/libnode.127.dylib]
 3: 0x195eebe80 start [/usr/lib/dyld]

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[assistant]
Node aborted at startup, but it worked a few calls ago, so this looks flaky rather than denied. I'll retry the same command once.

[tool Bash]
{
  "command": "node -e \"console.log(1+1)\" 2>&1 | head -5",
  "description": "Retry Node startup check"
}

[tool error]
Exit code 1
2
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
Chrome can't run in this sandboxed environment, so I'll build a Node-based test harness instead—using a mock Canvas2D rasterizer to render PNG screenshots and run the wax simulation headlessly for checking merge/split behavior. Starting with the mock rasterizer and PNG writer now.

[tool Write]
{
  "file_path": "[workspace]/.t/mock2d.js",
  "content": "'use strict';\n// Minimal software Canvas2D (subset) used only to preview the page's drawing code in Node.\nconst fs = require('fs');\nconst zlib = require('zlib');\n\nconst TAU = Math.PI * 2;\nconst NAMED = { transparent: [0, 0, 0, 0], white: [255, 255, 255, 1], black: [0, 0, 0, 1] };\n\nfunction parseColor(s) {\n  if (Array.isArray(s)) return s;\n  s = String(s).trim().toLowerCase();\n  if (NAMED[s]) return NAMED[s];\n  let m;\n  if ((m = /^#([0-9a-f]{3})$/.exec(s))) {\n    const h = m[1];\n    return [parseInt(h[0] + h[0], 16), parseInt(h[1] + h[1], 16), parseInt(h[2] + h[2], 16), 1];\n  }\n  if ((m = /^#([0-9a-f]{6})$/.exec(s))) {\n    const h = m[1];\n    return [parseInt(h.slice(0, 2), 16), parseInt(h.slice(2, 4), 16), parseInt(h.slice(4, 6), 16), 1];\n  }\n  if ((m = /^#([0-9a-f]{8})$/.exec(s))) {\n    const h = m[1];\n    return [parseInt(h.slice(0, 2), 16), parseInt(h.slice(2, 4), 16), parseInt(h.slice(4, 6), 16), parseInt(h.slice(6, 8), 16) / 255];\n  }\n  if ((m = /^rgba?\\(([^)]+)\\)$/.exec(s))) {\n    const p = m[1].split(',').map(parseFloat);\n    return [p[0], p[1], p[2], p.length > 3 ? p[3] : 1];\n  }\n  throw new Error('mock2d: unsupported color ' + s);\n}\n\nclass Gradient {\n  constructor(kind, a) { this.kind = kind; this.a = a; this.stops = []; this.inv = null; }\n  addColorStop(t, c) {\n    if (!(t >= 0 && t <= 1)) throw new Error('mock2d: bad color stop offset ' + t);\n    this.stops.push({ t, c: parseColor(c) });\n    this.stops.sort((p, q) => p.t - q.t);\n  }\n  prepare(ctm) {\n    const [a, b, c, d, e, f] = ctm;\n    const det = a * d - b * c;\n    this.inv = [d / det, -b / det, -c / det, a / det, (c * f - d * e) / det, (b * e - a * f) / det];\n  }\n  // returns false if undefined at this pixel; fills out [r,g,b,a] (non-premultiplied, a 0..1)\n  sample(px, py, out) {\n    const m = this.inv;\n    const x = m[0] * px + m[2] * py + m[4], y = m[1] * px + m[3] * py + m[5];\n    let t;\n    if (this.kind === 'linear') {\n      const [x0, y0, x1, y1] = this.a;\n      const dx = x1 - x0, dy = y1 - y0, l2 = dx * dx + dy * dy;\n      if (l2 === 0) return false;\n      t = ((x - x0) * dx + (y - y0) * dy) / l2;\n    } else {\n      const [x0, y0, r0, x1, y1, r1] = this.a;\n      const cdx = x1 - x0, cdy = y1 - y0, dr = r1 - r0;\n      const pdx = x - x0, pdy = y - y0;\n      const A = cdx * cdx + cdy * cdy - dr * dr;\n      const B = pdx * cdx + pdy * cdy + r0 * dr;\n      const C = pdx * pdx + pdy * pdy - r0 * r0;\n      let s = NaN;\n      if (Math.abs(A) < 1e-9) {\n        if (Math.abs(B) < 1e-12) return false;\n        s = C / (2 * B);\n        if (r0 + s * dr < 0) return false;\n      } else {\n        const disc = B * B - A * C;\n        if (disc < 0) return false;\n        const sq = Math.sqrt(disc);\n        const s1 = (B + sq) / A, s2 = (B - sq) / A;\n        const hi = Math.max(s1, s2), lo = Math.min(s1, s2);\n        if (r0 + hi * dr >= 0) s = hi; else if (r0 + lo * dr >= 0) s = lo; else return false;\n      }\n      t = s;\n    }\n    const st = this.stops;\n    if (!st.length) return false;\n    if (t <= st[0].t) { const c = st[0].c; out[0] = c[0]; out[1] = c[1]; out[2] = c[2]; out[3] = c[3]; return true; }\n    const last = st[st.length - 1];\n    if (t >= last.t) { const c = last.c; out[0] = c[0]; out[1] = c[1]; out[2] = c[2]; out[3] = c[3]; return true; }\n    for (let i = 1; i < st.length; i++) {\n      if (t <= st[i].t) {\n        const a = st[i - 1], b = st[i];\n        const k = b.t === a.t ? 1 : (t - a.t) / (b.t - a.t);\n        out[0] = a.c[0] + (b.c[0] - a.c[0]) * k;\n        out[1] = a.c[1] + (b.c[1] - a.c[1]) * k;\n        out[2] = a.c[2] + (b.c[2] - a.c[2]) * k;\n        out[3] = a.c[3] + (b.c[3] - a.c[3]) * k;\n        return true;\n      }\n    }\n    return false;\n  }\n}\n\n// ---- coverage rasterizer: polygons (device space) -> Float32Array row coverage callbacks ----\nconst SUB = 4;\nfunction rasterize(polys, W, H, rule, rowCb) {\n  // polys: array of arrays of [x,y]; implicitly closed\n  let ymin = Infinity, ymax = -Infinity, xmin = Infinity, xmax = -Infinity;\n  const edges = [];\n  for (const p of polys) {\n    const n = p.length;\n    if (n < 2) continue;\n    for (let i = 0; i < n; i++) {\n      const a = p[i], b = p[(i + 1) % n];\n      if (a[1] === b[1]) continue;\n      const e = a[1] < b[1] ? [a[0], a[1], b[0], b[1], 1] : [b[0], b[1], a[0], a[1], -1];\n      edges.push(e);\n      if (e[1] < ymin) ymin = e[1];\n      if (e[3] > ymax) ymax = e[3];\n    }\n    for (const q of p) { if (q[0] < xmin) xmin = q[0]; if (q[0] > xmax) xmax = q[0]; }\n  }\n  if (!edges.length) return;\n  const y0 = Math.max(0, Math.floor(ymin)), y1 = Math.min(H - 1, Math.floor(ymax));\n  if (y1 < y0) return;\n  // bucket edges by sub-scanline rows (coarse: by pixel row)\n  const buckets = new Array(y1 - y0 + 1);\n  for (let i = 0; i < buckets.length; i++) buckets[i] = null;\n  for (const e of edges) {\n    const a = Math.max(y0, Math.floor(e[1])), b = Math.min(y1, Math.floor(e[3]));\n    for (let y = a; y <= b; y++) (buckets[y - y0] || (buckets[y - y0] = [])).push(e);\n  }\n  const cov = new Float32Array(W);\n  const xs = [];\n  const px0 = Math.max(0, Math.floor(xmin)), px1 = Math.min(W - 1, Math.floor(xmax));\n  for (let y = y0; y <= y1; y++) {\n    const bk = buckets[y - y0];\n    if (!bk) continue;\n    for (let x = px0; x <= px1; x++) cov[x] = 0;\n    let any = false;\n    for (let s = 0; s < SUB; s++) {\n      const sy = y + (s + 0.5) / SUB;\n      xs.length = 0;\n      for (const e of bk) {\n        if (sy >= e[1] && sy < e[3]) xs.push([e[0] + (sy - e[1]) * (e[2] - e[0]) / (e[3] - e[1]), e[4]]);\n      }\n      if (xs.length < 2) continue;\n      xs.sort((p, q) => p[0] - q[0]);\n      let wind = 0;\n      for (let i = 0; i < xs.length - 1; i++) {\n        wind += xs[i][1];\n        const inside = rule === 'evenodd' ? ((i + 1) & 1) === 1 : wind !== 0;\n        if (!inside) continue;\n        let xa = xs[i][0], xb = xs[i + 1][0];\n        if (xb <= px0 || xa >= px1 + 1) continue;\n        if (xa < px0) xa = px0;\n        if (xb > px1 + 1) xb = px1 + 1;\n        if (xb <= xa) continue;\n        any = true;\n        const ia = Math.floor(xa), ib = Math.floor(xb);\n        if (ia === ib) cov[ia] += (xb - xa) / SUB;\n        else {\n          cov[ia] += (ia + 1 - xa) / SUB;\n          for (let x = ia + 1; x < ib; x++) cov[x] += 1 / SUB;\n          if (ib <= px1) cov[ib] += (xb - ib) / SUB;\n        }\n      }\n    }\n    if (any) rowCb(y, cov, px0, px1);\n  }\n}\n\nclass MockCanvas {\n  constructor(w = 300, h = 150) {\n    this.style = {};\n    this._w = 0; this._h = 0; this._ctx = null; this.id = '';\n    this._setSize(w, h);\n  }\n  _setSize(w, h) {\n    this._w = Math.max(0, Math.floor(w)); this._h = Math.max(0, Math.floor(h));\n    this._buf = new Float32Array(this._w * this._h * 4);\n    if (this._ctx) this._ctx.reset();\n  }\n  get width() { return this._w; }\n  set width(v) { this._setSize(v, this._h); }\n  get height() { return this._h; }\n  set height(v) { this._setSize(this._w, v); }\n  getContext(type) {\n    if (type !== '2d') return null;\n    if (!this._ctx) this._ctx = new MockCtx(this);\n    return this._ctx;\n  }\n}\n\nconst STATE_KEYS = ['ctm', 'fillStyle', 'strokeStyle', 'globalAlpha', 'lineWidth', 'lineCap', 'lineJoin', 'miterLimit',\n  'globalCompositeOperation', 'imageSmoothingEnabled', 'imageSmoothingQuality', 'clipMask'];\n\nclass MockCtx {\n  constructor(canvas) { this.canvas = canvas; this.stack = []; this.reset(); }\n  reset() {\n    this.ctm = [1, 0, 0, 1, 0, 0];\n    this.fillStyle = '#000000'; this.strokeStyle = '#000000';\n    this.globalAlpha = 1; this.lineWidth = 1; this.lineCap = 'butt'; this.lineJoin = 'miter'; this.miterLimit = 10;\n    this.globalCompositeOperation = 'source-over';\n    this.imageSmoothingEnabled = true; this.imageSmoothingQuality = 'low';\n    this.clipMask = null;\n    this.subpaths = []; this.cur = null;\n    this.stack.length = 0;\n  }\n  save() {\n    const s = {};\n    for (const k of STATE_KEYS) s[k] = this[k];\n    s.ctm = this.ctm.slice();\n    this.stack.push(s);\n  }\n  restore() {\n    const s = this.stack.pop();\n    if (!s) return;\n    for (const k of STATE_KEYS) this[k] = s[k];\n  }\n  // --- transforms ---\n  setTransform(a, b, c, d, e, f) { this.ctm = [a, b, c, d, e, f]; }\n  resetTransform() { this.ctm = [1, 0, 0, 1, 0, 0]; }\n  transform(a, b, c, d, e, f) {\n    const m = this.ctm;\n    this.ctm = [m[0] * a + m[2] * b, m[1] * a + m[3] * b, m[0] * c + m[2] * d, m[1] * c + m[3] * d,\n      m[0] * e + m[2] * f + m[4], m[1] * e + m[3] * f + m[5]];\n  }\n  translate(x, y) { this.transform(1, 0, 0, 1, x, y); }\n  scale(x, y) { this.transform(x, 0, 0, y, 0, 0); }\n  rotate(a) { const c = Math.cos(a), s = Math.sin(a); this.transform(c, s, -s, c, 0, 0); }\n  _tx(x, y) { const m = this.ctm; return [m[0] * x + m[2] * y + m[4], m[1] * x + m[3] * y + m[5]]; }\n  _scaleFactor() { const m = this.ctm; return Math.sqrt(Math.abs(m[0] * m[3] - m[1] * m[2])); }\n  // --- paths ---\n  beginPath() { this.subpaths = []; this.cur = null; }\n  moveTo(x, y) { this.cur = { pts: [this._tx(x, y)], closed: false }; this.subpaths.push(this.cur); }\n  _ensure(x, y) { if (!this.cur) this.moveTo(x, y); }\n  lineTo(x, y) { if (!this.cur) { this.moveTo(x, y); return; } this.cur.pts.push(this._tx(x, y)); }\n  closePath() {\n    if (!this.cur) return;\n    this.cur.closed = true;\n    const start = this.cur.pts[0];\n    this.cur = { pts: [start.slice()], closed: false };\n    this.subpaths.push(this.cur);\n  }\n  _last() { return this.cur.pts[this.cur.pts.length - 1]; }\n  quadraticCurveTo(cx, cy, x, y) {\n    this._ensure(cx, cy);\n    const p0 = this._last(), p1 = this._tx(cx, cy), p2 = this._tx(x, y);\n    for (let i = 1; i <= 20; i++) {\n      const t = i / 20, u = 1 - t;\n      this.cur.pts.push([u * u * p0[0] + 2 * u * t * p1[0] + t * t * p2[0], u * u * p0[1] + 2 * u * t * p1[1] + t * t * p2[1]]);\n    }\n  }\n  bezierCurveTo(c1x, c1y, c2x, c2y, x, y) {\n    this._ensure(c1x, c1y);\n    const p0 = this._last(), p1 = this._tx(c1x, c1y), p2 = this._tx(c2x, c2y), p3 = this._tx(x, y);\n    for (let i = 1; i <= 28; i++) {\n      const t = i / 28, u = 1 - t;\n      const a = u * u * u, b = 3 * u * u * t, c = 3 * u * t * t, d = t * t * t;\n      this.cur.pts.push([a * p0[0] + b * p1[0] + c * p2[0] + d * p3[0], a * p0[1] + b * p1[1] + c * p2[1] + d * p3[1]]);\n    }\n  }\n  rect(x, y, w, h) {\n    this.moveTo(x, y); this.lineTo(x + w, y); this.lineTo(x + w, y + h); this.lineTo(x, y + h); this.closePath();\n    this.moveTo(x, y);\n  }\n  ellipse(x, y, rx, ry, rot, a0, a1, acw) {\n    let d = a1 - a0;\n    if (!acw) { d = d >= TAU ? TAU : ((d % TAU) + TAU) % TAU; }\n    else { d = d <= -TAU ? -TAU : -((((-d) % TAU) + TAU) % TAU); }\n    const sc = this._scaleFactor();\n    const n = Math.max(10, Math.ceil(Math.abs(d) * Math.sqrt(Math.max(rx, ry) * sc + 1) * 2.2));\n    const cr = Math.cos(rot), sr = Math.sin(rot);\n    for (let i = 0; i <= n; i++) {\n      const a = a0 + d * i / n;\n      const ex = rx * Math.cos(a), ey = ry * Math.sin(a);\n      const ux = x + ex * cr - ey * sr, uy = y + ex * sr + ey * cr;\n      if (i === 0) { if (this.cur && this.cur.pts.length) this.lineTo(ux, uy); else this.moveTo(ux, uy); }\n      else this.lineTo(ux, uy);\n    }\n  }\n  arc(x, y, r, a0, a1, acw) { this.ellipse(x, y, r, r, 0, a0, a1, acw); }\n  // --- painting ---\n  _paint(style) {\n    if (style instanceof Gradient) { style.prepare(this.ctm); return { grad: style }; }\n    const c = parseColor(style);\n    return { color: c };\n  }\n  _fillPolys(polys, style, rule) {\n    const cv = this.canvas, W = cv._w, H = cv._h, buf = cv._buf;\n    const paint = this._paint(style);\n    const ga = this.globalAlpha, op = this.globalCompositeOperation, clip = this.clipMask;\n    const tmp = [0, 0, 0, 0];\n    rasterize(polys, W, H, rule || 'nonzero', (y, cov, xa, xb) => {\n      for (let x = xa; x <= xb; x++) {\n        let c = cov[x];\n        if (c <= 0) continue;\n        if (c > 1) c = 1;\n        if (clip) c *= clip[y * W + x];\n        if (c <= 0) continue;\n        let r, g, b, a;\n        if (paint.color) { r = paint.color[0]; g = paint.color[1]; b = paint.color[2]; a = paint.color[3]; }\n        else { if (!paint.grad.sample(x + 0.5, y + 0.5, tmp)) continue; r = tmp[0]; g = tmp[1]; b = tmp[2]; a = tmp[3]; }\n        a *= ga * c;\n        blend(buf, (y * W + x) * 4, r / 255 * a, g / 255 * a, b / 255 * a, a, op);\n      }\n    });\n  }\n  _pathPolys() { return this.subpaths.filter(s => s.pts.length >= 2).map(s => s.pts); }\n  fill(rule) { this._fillPolys(this._pathPolys(), this.fillStyle, rule); }\n  fillRect(x, y, w, h) {\n    const m = this.ctm;\n    const poly = [this._tx(x, y), this._tx(x + w, y), this._tx(x + w, y + h), this._tx(x, y + h)];\n    this._fillPolys([poly], this.fillStyle);\n  }\n  clearRect(x, y, w, h) {\n    const cv = this.canvas, W = cv._w, H = cv._h, buf = cv._buf;\n    const poly = [this._tx(x, y), this._tx(x + w, y), this._tx(x + w, y + h), this._tx(x, y + h)];\n    rasterize([poly], W, H, 'nonzero', (yy, cov, xa, xb) => {\n      for (let xx = xa; xx <= xb; xx++) {\n        const c = Math.min(1, cov[xx]);\n        if (c <= 0) continue;\n        const i = (yy * W + xx) * 4;\n        for (let k = 0; k < 4; k++) buf[i + k] *= 1 - c;\n      }\n    });\n  }\n  stroke() {\n    const sc = this._scaleFactor();\n    const hw = Math.max(this.lineWidth * sc, 0.0001) / 2;\n    const polys = [];\n    const ccw = (p) => { let a = 0; for (let i = 0; i < p.length; i++) { const q = p[(i + 1) % p.length]; a += p[i][0] * q[1] - q[0] * p[i][1]; } return a >= 0 ? p : p.slice().reverse(); };\n    const circle = (c, r) => { const n = Math.max(8, Math.ceil(r * 4)); const p = []; for (let i = 0; i < n; i++) { const a = TAU * i / n; p.push([c[0] + r * Math.cos(a), c[1] + r * Math.sin(a)]); } return p; };\n    for (const sp of this.subpaths) {\n      let pts = sp.pts.filter((p, i, arr) => i === 0 || Math.hypot(p[0] - arr[i - 1][0], p[1] - arr[i - 1][1]) > 1e-6);\n      if (sp.closed && pts.length > 1) { const a = pts[0], b = pts[pts.length - 1]; if (Math.hypot(a[0] - b[0], a[1] - b[1]) < 1e-6) pts = pts.slice(0, -1); }\n      if (pts.length < 2) { if (pts.length === 1 && this.lineCap === 'round' && sp.closed) polys.push(circle(pts[0], hw)); continue; }\n      const segs = [];\n      const n = pts.length;\n      const last = sp.closed ? n : n - 1;\n      for (let i = 0; i < last; i++) segs.push([pts[i], pts[(i + 1) % n]]);\n      for (let i = 0; i < segs.length; i++) {\n        const [a, b] = segs[i];\n        let dx = b[0] - a[0], dy = b[1] - a[1];\n        const l = Math.hypot(dx, dy); dx /= l; dy /= l;\n        const nx = -dy * hw, ny = dx * hw;\n        let a2 = a, b2 = b;\n        if (!sp.closed && this.lineCap === 'square') {\n          if (i === 0) a2 = [a[0] - dx * hw, a[1] - dy * hw];\n          if (i === segs.length - 1) b2 = [b[0] + dx * hw, b[1] + dy * hw];\n        }\n        polys.push(ccw([[a2[0] + nx, a2[1] + ny], [b2[0] + nx, b2[1] + ny], [b2[0] - nx, b2[1] - ny], [a2[0] - nx, a2[1] - ny]]));\n        // join with next segment: add a bevel wedge on both sides (cheap; round for fat lines)\n        const nxt = segs[i + 1] || (sp.closed ? segs[0] : null);\n        if (nxt) {\n          if (hw > 1.2 && this.lineJoin === 'round') polys.push(ccw(circle(b, hw)));\n          else {\n            let ex = nxt[1][0] - nxt[0][0], ey = nxt[1][1] - nxt[0][1];\n            const el = Math.hypot(ex, ey); ex /= el; ey /= el;\n            const mx = -ey * hw, my = ex * hw;\n            polys.push(ccw([b, [b[0] + nx, b[1] + ny], [b[0] + mx, b[1] + my]]));\n            polys.push(ccw([b, [b[0] - nx, b[1] - ny], [b[0] - mx, b[1] - my]]));\n          }\n        }\n      }\n      if (!sp.closed && this.lineCap === 'round') { polys.push(ccw(circle(pts[0], hw))); polys.push(ccw(circle(pts[n - 1], hw))); }\n    }\n    this._fillPolys(polys, this.strokeStyle, 'nonzero');\n  }\n  clip(rule) {\n    const cv = this.canvas, W = cv._w, H = cv._h;\n    const mask = new Float32Array(W * H);\n    rasterize(this._pathPolys(), W, H, rule || 'nonzero', (y, cov, xa, xb) => {\n      for (let x = xa; x <= xb; x++) mask[y * W + x] = Math.min(1, cov[x]);\n    });\n    if (this.clipMask) { const old = this.clipMask; for (let i = 0; i < mask.length; i++) mask[i] *= old[i]; }\n    this.clipMask = mask;\n  }\n  createLinearGradient(x0, y0, x1, y1) { return new Gradient('linear', [x0, y0, x1, y1]); }\n  createRadialGradient(x0, y0, r0, x1, y1, r1) { return new Gradient('radial', [x0, y0, r0, x1, y1, r1]); }\n  createImageData(w, h) { return { width: w, height: h, data: new Uint8ClampedArray(w * h * 4) }; }\n  putImageData(img, dx, dy) {\n    const cv = this.canvas, W = cv._w, H = cv._h, buf = cv._buf;\n    for (let y = 0; y < img.height; y++) {\n      const yy = y + dy; if (yy < 0 || yy >= H) continue;\n      for (let x = 0; x < img.width; x++) {\n        const xx = x + dx; if (xx < 0 || xx >= W) continue;\n        const s = (y * img.width + x) * 4, d = (yy * W + xx) * 4;\n        const a = img.data[s + 3] / 255;\n        buf[d] = img.data[s] / 255 * a; buf[d + 1] = img.data[s + 1] / 255 * a; buf[d + 2] = img.data[s + 2] / 255 * a; buf[d + 3] = a;\n      }\n    }\n  }\n  getImageData(x, y, w, h) {\n    const cv = this.canvas, W = cv._w, buf = cv._buf;\n    const out = new Uint8ClampedArray(w * h * 4);\n    for (let j = 0; j < h; j++) for (let i = 0; i < w; i++) {\n      const s = ((y + j) * W + (x + i)) * 4, d = (j * w + i) * 4;\n      const a = buf[s + 3];\n      out[d] = a > 0 ? buf[s] / a * 255 : 0; out[d + 1] = a > 0 ? buf[s + 1] / a * 255 : 0; out[d + 2] = a > 0 ? buf[s + 2] / a * 255 : 0; out[d + 3] = a * 255;\n    }\n    return { width: w, height: h, data: out };\n  }\n  drawImage(src, dx, dy, dw, dh) {\n    if (dw === undefined) { dw = src.width; dh = src.height; }\n    const cv = this.canvas, W = cv._w, H = cv._h, buf = cv._buf;\n    const m = this.ctm;\n    const x0 = m[0] * dx + m[4], y0 = m[3] * dy + m[5], x1 = m[0] * (dx + dw) + m[4], y1 = m[3] * (dy + dh) + m[5];\n    const sw = src._w, sh = src._h, sb = src._buf;\n    const clip = this.clipMask, ga = this.globalAlpha, op = this.globalCompositeOperation;\n    const ya = Math.max(0, Math.floor(Math.min(y0, y1))), yb = Math.min(H - 1, Math.ceil(Math.max(y0, y1)) - 1);\n    const xa = Math.max(0, Math.floor(Math.min(x0, x1))), xb = Math.min(W - 1, Math.ceil(Math.max(x0, x1)) - 1);\n    const out = [0, 0, 0, 0];\n    for (let y = ya; y <= yb; y++) for (let x = xa; x <= xb; x++) {\n      const fx = (x + 0.5 - x0) / (x1 - x0) * sw, fy = (y + 0.5 - y0) / (y1 - y0) * sh;\n      sampleBilinear(sb, sw, sh, fx, fy, out, this.imageSmoothingEnabled);\n      let k = ga * (clip ? clip[y * W + x] : 1);\n      if (k <= 0) continue;\n      blend(buf, (y * W + x) * 4, out[0] * k, out[1] * k, out[2] * k, out[3] * k, op);\n    }\n  }\n}\n\nfunction blend(buf, i, sr, sg, sb, sa, op) {\n  if (op === 'lighter') {\n    buf[i] = Math.min(1, buf[i] + sr); buf[i + 1] = Math.min(1, buf[i + 1] + sg); buf[i + 2] = Math.min(1, buf[i + 2] + sb); buf[i + 3] = Math.min(1, buf[i + 3] + sa);\n  } else if (op === 'destination-out') {\n    const k = 1 - sa;\n    buf[i] *= k; buf[i + 1] *= k; buf[i + 2] *= k; buf[i + 3] *= k;\n  } else {\n    const k = 1 - sa;\n    buf[i] = sr + buf[i] * k; buf[i + 1] = sg + buf[i + 1] * k; buf[i + 2] = sb + buf[i + 2] * k; buf[i + 3] = sa + buf[i + 3] * k;\n  }\n}\n\n// premultiplied bilinear sample at continuous source coords (pixel centers at +0.5)\nfunction sampleBilinear(buf, w, h, fx, fy, out, smooth) {\n  if (!smooth) {\n    const x = Math.min(w - 1, Math.max(0, Math.floor(fx))), y = Math.min(h - 1, Math.max(0, Math.floor(fy)));\n    const i = (y * w + x) * 4; out[0] = buf[i]; out[1] = buf[i + 1]; out[2] = buf[i + 2]; out[3] = buf[i + 3]; return;\n  }\n  fx -= 0.5; fy -= 0.5;\n  let x0 = Math.floor(fx), y0 = Math.floor(fy);\n  const tx = fx - x0, ty = fy - y0;\n  let x1 = x0 + 1, y1 = y0 + 1;\n  x0 = Math.min(w - 1, Math.max(0, x0)); x1 = Math.min(w - 1, Math.max(0, x1));\n  y0 = Math.min(h - 1, Math.max(0, y0)); y1 = Math.min(h - 1, Math.max(0, y1));\n  const i00 = (y0 * w + x0) * 4, i10 = (y0 * w + x1) * 4, i01 = (y1 * w + x0) * 4, i11 = (y1 * w + x1) * 4;\n  for (let k = 0; k < 4; k++) {\n    const a = buf[i00 + k] * (1 - tx) + buf[i10 + k] * tx;\n    const b = buf[i01 + k] * (1 - tx) + buf[i11 + k] * tx;\n    out[k] = a * (1 - ty) + b * ty;\n  }\n}\n\n// ---- PNG ----\nconst CRC = (() => { const t = new Uint32Array(256); for (let n = 0; n < 256; n++) { let c = n; for (let k = 0; k < 8; k++) c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1; t[n] = c >>> 0; } return t; })();\nfunction crc32(buf) { let c = 0xffffffff; for (let i = 0; i < buf.length; i++) c = CRC[(c ^ buf[i]) & 255] ^ (c >>> 8); return (c ^ 0xffffffff) >>> 0; }\nfunction chunk(type, data) {\n  const len = Buffer.alloc(4); len.writeUInt32BE(data.length);\n  const td = Buffer.concat([Buffer.from(type), data]);\n  const crc = Buffer.alloc(4); crc.writeUInt32BE(crc32(td));\n  return Buffer.concat([len, td, crc]);\n}\nfunction writePNG(file, w, h, rgba) {\n  const raw = Buffer.alloc((w * 4 + 1) * h);\n  for (let y = 0; y < h; y++) { raw[y * (w * 4 + 1)] = 0; Buffer.from(rgba.buffer, rgba.byteOffset + y * w * 4, w * 4).copy(raw, y * (w * 4 + 1) + 1); }\n  const ihdr = Buffer.alloc(13); ihdr.writeUInt32BE(w, 0); ihdr.writeUInt32BE(h, 4); ihdr[8] = 8; ihdr[9] = 6; ihdr[10] = 0; ihdr[11] = 0; ihdr[12] = 0;\n  fs.writeFileSync(file, Buffer.concat([Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]), chunk('IHDR', ihdr), chunk('IDAT', zlib.deflateSync(raw, { level: 6 })), chunk('IEND', Buffer.alloc(0))]));\n}\n\n// Composite CSS-positioned layers into an RGBA screenshot (CSS px * scale).\n// layers: [{canvas, left, top, width, height, opacity}] (CSS px), bg: [r,g,b]\nfunction composite(layers, vw, vh, scale, bg, crop) {\n  const cx = crop ? crop.x : 0, cy = crop ? crop.y : 0, cw = crop ? crop.w : vw, ch = crop ? crop.h : vh;\n  const W = Math.round(cw * scale), H = Math.round(ch * scale);\n  const out = new Float32Array(W * H * 4);\n  for (let i = 0; i < W * H; i++) { out[i * 4] = bg[0] / 255; out[i * 4 + 1] = bg[1] / 255; out[i * 4 + 2] = bg[2] / 255; out[i * 4 + 3] = 1; }\n  const tmp = [0, 0, 0, 0];\n  for (const L of layers) {\n    if (!L || !L.canvas || L.hidden) continue;\n    const op = L.opacity === undefined ? 1 : L.opacity;\n    if (op <= 0) continue;\n    const cv = L.canvas;\n    for (let y = 0; y < H; y++) {\n      const cssY = cy + (y + 0.5) / scale;\n      if (cssY < L.top || cssY >= L.top + L.height) continue;\n      for (let x = 0; x < W; x++) {\n        const cssX = cx + (x + 0.5) / scale;\n        if (cssX < L.left || cssX >= L.left + L.width) continue;\n        const fx = (cssX - L.left) / L.width * cv._w, fy = (cssY - L.top) / L.height * cv._h;\n        sampleBilinear(cv._buf, cv._w, cv._h, fx, fy, tmp, true);\n        const a = tmp[3] * op;\n        if (a <= 0) continue;\n        const i = (y * W + x) * 4, k = 1 - a;\n        out[i] = tmp[0] * op + out[i] * k; out[i + 1] = tmp[1] * op + out[i + 1] * k; out[i + 2] = tmp[2] * op + out[i + 2] * k;\n      }\n    }\n  }\n  const rgba = new Uint8Array(W * H * 4);\n  for (let i = 0; i < W * H; i++) {\n    rgba[i * 4] = Math.round(Math.min(1, out[i * 4]) * 255); rgba[i * 4 + 1] = Math.round(Math.min(1, out[i * 4 + 1]) * 255);\n    rgba[i * 4 + 2] = Math.round(Math.min(1, out[i * 4 + 2]) * 255); rgba[i * 4 + 3] = 255;\n  }\n  return { w: W, h: H, rgba };\n}\n\nmodule.exports = { MockCanvas, MockCtx, Gradient, parseColor, writePNG, composite, sampleBilinear };\n"
}

[tool result]
File created successfully at: [workspace]/.t/mock2d.js (file state is current in your context — no need to Read it back)

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[assistant]
Quick sanity test of the mock rasterizer: gradients, strokes, clipping and curves.

[tool Write]
{
  "file_path": "[workspace]/.t/test_mock.js",
  "content": "'use strict';\nconst { MockCanvas, writePNG, composite } = require('./mock2d.js');\nconst fs = require('fs');\nfs.mkdirSync(__dirname + '/out', { recursive: true });\n\nconst c = new MockCanvas(400, 300);\nconst g = c.getContext('2d');\nlet t0 = Date.now();\nconst bg = g.createLinearGradient(0, 0, 0, 300);\nbg.addColorStop(0, '#101a40'); bg.addColorStop(1, '#402010');\ng.fillStyle = bg; g.fillRect(0, 0, 400, 300);\n\nconst rg = g.createRadialGradient(100, 100, 5, 100, 100, 70);\nrg.addColorStop(0, 'rgba(255,200,80,1)'); rg.addColorStop(1, 'rgba(255,80,0,0)');\ng.fillStyle = rg; g.beginPath(); g.arc(100, 100, 70, 0, Math.PI * 2); g.fill();\n\ng.save();\ng.beginPath(); g.ellipse(250, 100, 60, 30, 0.4, 0, Math.PI * 2); g.clip();\nconst lg = g.createLinearGradient(190, 0, 310, 0);\nlg.addColorStop(0, '#fff'); lg.addColorStop(0.5, '#6cf'); lg.addColorStop(1, '#036');\ng.fillStyle = lg; g.fillRect(150, 50, 200, 100);\ng.restore();\n\ng.strokeStyle = 'rgba(255,255,255,0.9)'; g.lineWidth = 6; g.lineCap = 'round'; g.lineJoin = 'round';\ng.beginPath(); g.moveTo(40, 220); g.bezierCurveTo(100, 150, 160, 290, 220, 210); g.quadraticCurveTo(260, 180, 300, 240); g.stroke();\ng.lineWidth = 1; g.strokeStyle = '#f0f'; g.beginPath(); g.rect(30, 30, 40, 40); g.stroke();\ng.globalCompositeOperation = 'lighter'; g.fillStyle = 'rgba(80,0,0,0.5)';\ng.beginPath(); g.arc(300, 220, 40, 0, Math.PI * 2); g.fill();\ng.beginPath(); g.arc(330, 220, 40, 0, Math.PI * 2); g.fill();\nconsole.log('draw ms', Date.now() - t0);\n\nconst out = composite([{ canvas: c, left: 0, top: 0, width: 400, height: 300, opacity: 1 }], 400, 300, 1, [0, 0, 0]);\nwritePNG(__dirname + '/out/mock.png', out.w, out.h, out.rgba);\nconsole.log('wrote', out.w, out.h);\n"
}

[tool result]
File created successfully at: [workspace]/.t/test_mock.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/test_mock.js 2>&1 | head -20; ls -la .t/out 2>&1 | head",
  "description": "Run mock rasterizer sanity test"
}

[tool error]
Exit code 1
draw ms 27
wrote 400 300
total 64
drwxr-xr-x@ 3 [redacted:username]  wheel     96 Oct 28 13:30 .
drwxr-xr-x@ 8 [redacted:username]  wheel    256 Oct 28 13:30 ..
-rw-r--r--@ 1 [redacted:username]  wheel  30144 Oct 28 13:30 mock.png
zsh:1: operation not permitted: [redacted:local-path]

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[tool Read]
{
  "file_path": "[workspace]/.t/out/mock.png"
}

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[thinking]
The mock rasterizer is working correctly across gradients, clipping, curves, caps, and blending. Now I'll build the actual page: static elements drawn once per resize, a wax canvas updated each frame via a WebGL metaball shader (with a CPU fallback used as reference), and blob physics driven by temperature-based buoyancy and merging.

[tool Write]
{
  "file_path": "[workspace]/index.html",
  "content": "\n\n\n\nLava Lamp\n\n\n\n\n\n\n\n
\n  \n  \n  \n  \n  \n  \n  
A glass lava lamp on a desk. Warm wax blobs rise, sink, merge and split. Use the switch to turn the lamp off and on.
\n  
\n
\n
\n\n\n\n\n"
}

[tool result]
File created successfully at: [workspace]/index.html (file state is current in your context — no need to Read it back)

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[assistant]
Next, the Node harness. It runs the page's own `
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[thinking]
I'll rewrite the app section to fix blank frames by adapting quality before drawing, rendering once at startup, and smoothing frame time measurements. I'll also clean up the switch layout and add recovery logic for lost WebGL contexts.

[tool Write]
{
  "file_path": "[workspace]/.t/newapp.js",
  "content": "/* ======================================================================\n   App: layers, resize, main loop, switch\n   ====================================================================== */\nconst room = $('room'), bgC = $('bg'), glowC = $('glow'), fgC = $('fg'), litC = $('lit');\nconst swBtn = $('sw'), swC = $('swc'), hud = $('fps');\nlet waxC = $('wax');\nconst ub = new Float32Array(N * 4), us = new Float32Array(N);\nconst LAMP = [12, 32, 88, 168];                        // stage rectangle that holds the lamp hardware\n\nconst qs = win.location.search + win.location.hash;\nconst forceCPU = /[?&#]cpu\\b/.test(qs);\nif (/[?&#]fps\\b/.test(qs)) hud.style.display = 'block';\n\nlet wax = null, waxQual = 1, swPos = 1, light = 1, dirty = true;\n\nfunction place(el, x0, y0, x1, y1, dpr) {              // position a canvas over a stage rectangle, return its context\n  const u = L.u, w = (x1 - x0) * u, h = (y1 - y0) * u, s = el.style;\n  s.left = (L.ox + x0 * u) + 'px'; s.top = (L.oy + y0 * u) + 'px'; s.width = w + 'px'; s.height = h + 'px';\n  const pw = Math.max(1, Math.round(w * dpr)), ph = Math.max(1, Math.round(h * dpr));\n  el.width = pw; el.height = ph;\n  const c = el.getContext('2d');\n  c.setTransform(pw / (x1 - x0), 0, 0, ph / (y1 - y0), -x0 * pw / (x1 - x0), -y0 * ph / (y1 - y0));\n  return c;\n}\n\nfunction drawStatic() {\n  const dpr = win.devicePixelRatio || 1, u = L.u;\n  const e = { x0: -L.ox / u, y0: -L.oy / u, x1: (L.vw - L.ox) / u, y1: (L.vh - L.oy) / u };\n  drawBackground(place(bgC, e.x0, e.y0, e.x1, e.y1, Math.min(dpr, 2)), e);\n  drawGlow(place(glowC, e.x0, e.y0, e.x1, e.y1, 0.5), e);\n  drawFront(place(fgC, LAMP[0], LAMP[1], LAMP[2], LAMP[3], Math.min(dpr, 3)));\n  drawLit(place(litC, LAMP[0], LAMP[1], LAMP[2], LAMP[3], Math.min(dpr, 3)));\n\n  // the switch is a real button: its art scales with the lamp but never drops below a comfortable touch target\n  const w = Math.max(SWITCH_W * u, 68), h = w * SWITCH_H / SWITCH_W, s = swBtn.style;\n  const top = Math.min(L.oy + SWITCH_Y * u - h / 2, L.oy + (DESK_FRONT - 0.6) * u - h);\n  s.width = w + 'px'; s.height = h + 'px';\n  s.left = (L.ox + CX * u - w / 2) + 'px'; s.top = top + 'px';\n  swC.width = Math.round(w * Math.min(dpr, 3)); swC.height = Math.round(h * Math.min(dpr, 3));\n  drawSwitchNow();\n}\n\nfunction drawSwitchNow() { drawSwitch(swC.getContext('2d'), swC.width, swC.height, swPos); }\n\nfunction placeWax() {\n  const dpr = Math.min(win.devicePixelRatio || 1, 2) * waxQual;\n  const st = waxC.style, u = L.u;\n  st.left = (L.ox + (CX + WX0) * u) + 'px'; st.top = (L.oy + (FLOOR - WY1) * u) + 'px';\n  st.width = WW * u + 'px'; st.height = WH * u + 'px';\n  wax.resize(Math.max(8, Math.round(WW * u * dpr)), Math.max(8, Math.round(WH * u * dpr)));\n}\n\nfunction useCPU(replaceCanvas) {\n  if (replaceCanvas) {                                  // a canvas that has had a WebGL context can never give a 2D one\n    const fresh = doc.createElement('canvas');\n    fresh.id = 'wax'; fresh.setAttribute('aria-hidden', 'true');\n    waxC.parentNode.replaceChild(fresh, waxC);\n    waxC = fresh;\n  }\n  wax = makeCPU(waxC);\n}\n\nfunction initWax() {\n  wax = null;\n  if (!forceCPU) {\n    const r = makeGL(waxC);\n    if (r.gl && !r.bad) {\n      wax = r;\n      if (!waxC.glEvents) {\n        waxC.glEvents = true;\n        waxC.addEventListener('webglcontextlost', e => {\n          e.preventDefault(); wax = null;\n          win.setTimeout(() => { if (!wax) { useCPU(true); placeWax(); dirty = true; } }, 1500);   // never came back: carry on without the GPU\n        }, false);\n        waxC.addEventListener('webglcontextrestored', () => { initWax(); placeWax(); dirty = true; }, false);\n      }\n    } else if (r.gl) useCPU(true);\n  }\n  if (!wax) useCPU(false);\n}\n\nfunction relayout() {\n  const vw = room.clientWidth || win.innerWidth, vh = room.clientHeight || win.innerHeight;\n  if (vw < 2 || vh < 2) return;\n  const safe = parseFloat(win.getComputedStyle($('safe')).paddingBottom) || 0;\n  L = computeLayout(vw, vh, clamp(safe, 0, 28));\n  drawStatic();\n  if (wax) placeWax();\n  dirty = true;\n}\n\nfunction setPower(on) {\n  sim.power = on ? 1 : 0;\n  swBtn.setAttribute('aria-checked', on ? 'true' : 'false');\n  if (win.navigator && win.navigator.vibrate) win.navigator.vibrate(8);\n}\nswBtn.addEventListener('click', () => setPower(!sim.power), false);\n\nfunction packBlobs() {                                  // sim state -> renderer inputs; true while anything is still moving\n  const { x, y, r, T, st, vx, vy, ph, time } = sim;\n  let moving = false;\n  for (let i = 0; i < N; i++) {\n    const o = i * 4;\n    ub[o] = x[i]; ub[o + 1] = y[i]; ub[o + 2] = r[i] * (1 + 0.03 * Math.sin(time * 1.1 + ph[i])); ub[o + 3] = T[i];\n    us[i] = st[i];\n    if (Math.abs(vx[i]) + Math.abs(vy[i]) > 0.01) moving = true;\n  }\n  return moving;\n}\n\nfunction drawWax() {\n  if (!wax) return;\n  if (wax.kind === 'gl' && !wax.checked) {              // first GPU frame: make sure it agrees with the JS reference\n    wax.checked = true;\n    if (!wax.verify()) { useCPU(true); placeWax(); }\n  }\n  wax.draw(ub, us, light);\n}\n\nlet last = 0, relayoutPending = false, frames = 0, hudT = 0, hudN = 0, slow = 0, dtAvg = 1 / 60;\n\n// trade wax resolution for speed if this device cannot keep up (the canvas is redrawn in the same frame)\nfunction adaptQuality(dtRaw) {\n  if (dtRaw < 0.1) dtAvg += (dtRaw - dtAvg) * 0.05;\n  if (!wax || ++frames < 90 || frames % 45) return;\n  if (wax.kind === 'cpu') { if (wax.adapt()) dirty = true; }\n  else if (dtAvg > 0.0215) {\n    if (++slow >= 2 && waxQual > 0.55) { waxQual *= 0.8; placeWax(); slow = 0; dirty = true; }\n  } else slow = 0;\n}\n\nfunction frame(t) {\n  win.requestAnimationFrame(frame);\n  const dtRaw = last ? (t - last) / 1000 : 1 / 60;\n  last = t;\n  const dt = clamp(dtRaw, 0, 0.1);\n\n  if (relayoutPending) { relayoutPending = false; relayout(); }\n  adaptQuality(dtRaw);\n\n  const n = Math.max(1, Math.ceil(dt * 90)), h = dt / n;\n  for (let i = 0; i < n; i++) sim.step(h);\n\n  const target = sim.power, lt = target > light ? 0.45 : 0.7;\n  const nl = Math.abs(target - light) < 0.002 ? target : light + (target - light) * (1 - Math.exp(-dt / lt));\n  if (nl !== light) {\n    light = nl; dirty = true;\n    const o = String(Math.round(light * 1000) / 1000);\n    glowC.style.opacity = o; litC.style.opacity = o;\n  }\n  const sp = Math.abs(sim.power - swPos) < 0.01 ? sim.power : swPos + (sim.power - swPos) * (1 - Math.exp(-dt / 0.05));\n  if (sp !== swPos) { swPos = sp; drawSwitchNow(); }\n\n  const moving = packBlobs();\n  if (dirty || moving || sim.power || sim.heater > 0.01) { drawWax(); dirty = false; }\n\n  if (hud.style.display === 'block') {\n    hudN++;\n    if (t - hudT > 500) {\n      hud.textContent = Math.round(hudN * 1000 / (t - hudT)) + ' fps · ' + (wax ? wax.kind : '-');\n      hudT = t; hudN = 0;\n    }\n  }\n}\n\nwin.addEventListener('resize', () => { relayoutPending = true; }, false);\nwin.addEventListener('orientationchange', () => { relayoutPending = true; }, false);\ndoc.addEventListener('visibilitychange', () => { last = 0; }, false);\n\nsim.warm(70);                                           // start with the lamp already warmed up and cycling\ninitWax();\nrelayout();\npackBlobs(); drawWax();                                 // the very first paint is already complete\nwin.__lava = { sim, setPower, shade, fieldAt, get wax() { return wax; }, get layout() { return L; }, ub, us };\nwin.requestAnimationFrame(frame);\n})();\n"
}

[tool result]
File created successfully at: [workspace]/.t/newapp.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nconst lines=fs.readFileSync('index.html','utf8').split('\\n');\nconst a=lines.findIndex(l=>l.startsWith('   App: layers, resize, main loop, switch'))-1;\nconst b=lines.findIndex(l=>l==='');\nif(a<0||b<0||!lines[a].startsWith('/* ====')) throw new Error('markers '+a+' '+b);\nconst nb=fs.readFileSync('.t/newapp.js','utf8').replace(/\\n$/,'').split('\\n');\nlines.splice(a,b-a,...nb);\nfs.writeFileSync('index.html',lines.join('\\n'));\nconsole.log('replaced lines',a+1,'to',b,'with',nb.length);\n\" 2>&1 | head -5; tail -5 index.html",
  "description": "Splice rewritten app section into index.html"
}

[tool error]
Exit code 1
replaced lines 916 to 1072 with 176
win.requestAnimationFrame(frame);
})();



zsh:11: operation not permitted: [redacted:local-path]

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[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "  const gl = canvas.getContext('webgl', {\n    alpha: true, premultipliedAlpha: true, antialias: false, depth: false, stencil: false,\n    preserveDrawingBuffer: false, powerPreference: 'low-power'\n  });\n  if (!gl) return { gl: null };",
  "new_string": "  const attrs = {\n    alpha: true, premultipliedAlpha: true, antialias: false, depth: false, stencil: false,\n    preserveDrawingBuffer: false, powerPreference: 'low-power'\n  };\n  const gl = canvas.getContext('webgl', attrs) || canvas.getContext('experimental-webgl', attrs);\n  if (!gl) return { gl: null };"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (note: the file had been modified on disk since you last read it — the edit applied cleanly, but the file contains other changes not in your context. Read it before edits that depend on surrounding content.)

[tool Bash]
{
  "command": "node .t/t2.js 390 844 2 12 full2.png 1 2>&1 | head -5",
  "description": "Render full page with new proportions",
  "timeout": 300000
}

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[tool error]
Exit code 1
shot full2.png 390x844 dpr 2 render ms 42 layout {"vw":390,"vh":844,"u":3.9,"ox":0,"oy":142,"inset":0}
zsh:1: operation not permitted: [redacted:local-path]

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[tool Read]
{
  "file_path": "[workspace]/.t/out/full2.png"
}

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[image]

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[assistant]
This now reads as a real lava lamp. Next I'll test the switch: turn it off, let the wax cool and settle for 45 seconds, and look at the unlit state.

[tool Bash]
{
  "command": "node .t/crop.js 390 844 2 45 off45.png 0 0 390 844 1 off 2>&1 | head -3; node .t/crop.js 390 844 2 2 off2.png 0 0 390 844 1 off 2>&1 | head -3",
  "description": "Render lamp 2s and 45s after switching off",
  "timeout": 300000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_019hncgf7F8aGHQ291XboZ5L-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_019hncgf7F8aGHQ291XboZ5L","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"d9d20a18-a8d1-40f1-a415-6a4bc8a4c125"}

[system]
task_notification

[tool error]
Exit code 1
wrote off45.png
wrote off2.png
zsh:1: operation not permitted: [redacted:local-path]

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[tool Read]
{
  "file_path": "[workspace]/.t/out/off45.png"
}

[tool result]
[image]

[tool Read]
{
  "file_path": "[workspace]/.t/out/off2.png"
}

[tool result]
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[thinking]
The off state works—room cools, glass clears, and wax settles into a pool, though it forms round lumps instead of spreading flat, so I'll squash floor-contact blobs sideways. Next I'll check how quickly a cold pool starts moving after switching power back on.

[tool Write]
{
  "file_path": "[workspace]/.t/warmup.js",
  "content": "'use strict';\n// off for a while, then on: how long until the pool wakes up?\nconst { build } = require('./simlab.js');\nconst over = process.argv[2] ? JSON.parse(process.argv[2]) : {};\nconst { sim, N } = build(over);\nconst dt = 1 / 60;\nsim.warm(70);\nsim.power = 0;\nfor (let k = 0; k < 90 / dt; k++) sim.step(dt);\nconsole.log('after 90 s off: y =', Array.from(sim.y).map(v => v.toFixed(0)).join(' '), ' T =', Array.from(sim.T).map(v => v.toFixed(2)).join(' '));\nsim.power = 1;\nconsole.log('t(on) | blobs above y=12 | highest | moving (|vy|>1)');\nfor (let k = 0; k <= 60 / dt; k++) {\n  if (k % Math.round(3 / dt) === 0) {\n    let above = 0, hi = 0, mv = 0;\n    for (let i = 0; i < N; i++) { if (sim.y[i] > 12) above++; hi = Math.max(hi, sim.y[i]); if (Math.abs(sim.vy[i]) > 1) mv++; }\n    console.log(String((k * dt).toFixed(0)).padStart(4) + '  |  ' + above + '  |  ' + hi.toFixed(0) + '  |  ' + mv);\n  }\n  sim.step(dt);\n}\n"
}

[tool result]
File created successfully at: [workspace]/.t/warmup.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/warmup.js 2>&1 | head -30",
  "description": "Measure wake-up time after switching on from cold",
  "timeout": 120000
}

[tool error]
Exit code 1
after 90 s off: y = 5 3 3 3 2 2 2 2 2  T = 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
t(on) | blobs above y=12 | highest | moving (|vy|>1)
   0  |  0  |  5  |  1
   3  |  0  |  4  |  2
   6  |  0  |  4  |  1
   9  |  0  |  4  |  0
  12  |  0  |  11  |  5
  15  |  4  |  21  |  6
  18  |  6  |  31  |  8
  21  |  8  |  41  |  9
  24  |  9  |  52  |  9
  27  |  9  |  63  |  9
  30  |  9  |  69  |  8
  33  |  9  |  69  |  6
  36  |  9  |  67  |  8
  39  |  9  |  66  |  8
  42  |  9  |  66  |  7
  45  |  9  |  63  |  9
  48  |  9  |  58  |  9
  51  |  9  |  52  |  9
  54  |  9  |  45  |  9
  57  |  5  |  38  |  9
  60  |  4  |  31  |  6
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
I'll give each blob a randomized temperature offset and heating rate so they peel off the pool one at a time instead of rising as a synchronized wave, and add floor flattening for resting wax.

[tool Read]
{
  "file_path": "[workspace]/index.html",
  "offset": 497,
  "limit": 100
}

[tool result]
497	  repel: 0, repelTo: 0.7, cohesion: 0.15, cohTo: 1.45, slip: 0, hx: 0, couple: 0, minSep: 0.2
498	};
499	
500	const sim = (() => {
501	  const R = rng(20241028);
502	  const f64 = () => new Float64Array(N);
503	  const s = {
504	    x: f64(), y: f64(), vx: f64(), vy: f64(), r: Float64Array.from(RAD), T: f64(), T0: f64(), st: f64(),
505	    ph: f64(), wf: f64(), tvx: f64(), tvy: f64(), time: 0, power: 1, heater: 1
506	  };
507	  for (let i = 0; i < N; i++) {
508	    s.x[i] = (R() - 0.5) * 14; s.y[i] = 3 + i * 2.1 + R() * 3; s.T[i] = 0.15 + R() * 0.25;
509	    s.T0[i] = 0.44 + R() * 0.14; s.ph[i] = R() * TAU; s.wf[i] = 0.25 + R() * 0.35; s.st[i] = 1;
510	  }
511	  s.step = function (dt) {
512	    const { x, y, vx, vy, r, T, T0, st, ph, wf, tvx, tvy } = s;
513	    const kv = 1 - Math.exp(-dt / P.resp);
514	    s.time += dt;
515	    s.heater += (s.power - s.heater) * (1 - Math.exp(-dt / (s.power > s.heater ? 1.2 : 2.5)));
516	    const W = s.heater;
517	    const lag = (1 - W) * P.driftOff, run = W * P.runaway;             // off: wax cools to room temperature; on: no stable hover level
518	    for (let i = 0; i < N; i++) {
519	      const m = r[i] / 4, yi = y[i];
520	      const heatIn = P.heatIn * W * Math.exp(-yi / P.heatLen);         // only wax touching the hot floor warms up
521	      const heatOut = P.heatOut * Math.exp(-(GH - yi) / P.coolLen);    // only wax near the cool top loses its heat
522	      const dT = Math.pow(m, -0.7) * (heatIn * (1 - T[i]) - heatOut * T[i]) - lag * T[i] + run * (T[i] - T0[i]);
523	      T[i] = clamp(T[i] + dt * dT, 0, 1);
524	      let vt = (T[i] - T0[i]) * P.buoy * Math.sqrt(m);
525	      if (vt < 0) vt *= P.sinkK;
526	      else vt = Math.max(vt - P.stick * clamp(1 - (yi - 0.62 * r[i]) / 2.5, 0, 1), 0);   // wax clings to the floor until it is hot enough to tear free
527	      tvy[i] = vt;
528	      const room = Math.max(glassHW(Math.min(yi + 0.5 * r[i], GH)) - 0.88 * r[i], 0);   // sideways room at this height
529	      const lane = P.laneAmp * room * Math.sin(s.time * wf[i] * 0.35 + ph[i] + 1.7);    // each blob meanders in its own lane
530	      tvx[i] = P.lane * (lane - x[i]) + P.wander * Math.sin(s.time * wf[i] + ph[i]);
531	    }
532	    const cs = P.cohTo - P.repelTo;
533	    for (let i = 0; i < N; i++) {
534	      for (let j = i + 1; j < N; j++) {
535	        const dx = x[j] - x[i], dy = y[j] - y[i], rs = r[i] + r[j];
536	        const d2 = dx * dx + dy * dy, lim = rs * P.cohTo;
537	        if (d2 > lim * lim) continue;
538	        const d = Math.sqrt(d2) + 1e-6, u = d / rs, nx = dx / d, ny = dy / d;
539	        const sp = u < P.repelTo ? -P.repel * (P.repelTo - u) / P.repelTo : P.cohesion * Math.sin(Math.PI * (u - P.repelTo) / cs);
540	        const mi = r[i] * r[i], mj = r[j] * r[j], wi = mj / (mi + mj), wj = mi / (mi + mj);
541	        tvx[i] += nx * sp * wi; tvy[i] += ny * sp * wi;
542	        tvx[j] -= nx * sp * wj; tvy[j] -= ny * sp * wj;
543	        if (sp < 0) {                                                  // squeezed together: slip sideways past each other
544	          const slip = -sp * P.slip, side = dx >= 0 ? 1 : -1;
545	          tvx[i] -= side * slip * wi; tvx[j] += side * slip * wj;
546	        }
547	        const bond = u < P.repelTo ? 1 : 1 - (u - P.repelTo) / cs;     // touching blobs trade a little heat and drift together
548	        const hx = P.hx * bond * dt, cp = P.couple * bond;
549	        const dT = T[j] - T[i];
550	        T[i] += dT * hx * wi; T[j] -= dT * hx * wj;
551	        tvy[i] += (vy[j] - vy[i]) * cp * wi; tvy[j] -= (vy[j] - vy[i]) * cp * wj;
552	      }
553	    }
554	    for (let i = 0; i < N; i++) {
555	      vx[i] += (tvx[i] - vx[i]) * kv; vy[i] += (tvy[i] - vy[i]) * kv;
556	      x[i] += vx[i] * dt; y[i] += vy[i] * dt;
557	    }
558	    for (let i = 0; i < N; i++) {                       // never let centres coincide
559	      for (let j = i + 1; j < N; j++) {
560	        const dx = x[j] - x[i], dy = y[j] - y[i], min = P.minSep * (r[i] + r[j]);
561	        const d2 = dx * dx + dy * dy;
562	        if (d2 >= min * min) continue;
563	        const d = Math.sqrt(d2) + 1e-6, push = (min - d) * 0.5;
564	        const mi = r[i] * r[i], mj = r[j] * r[j], wi = mj / (mi + mj), wj = mi / (mi + mj);
565	        x[i] -= dx / d * push * 2 * wi; y[i] -= dy / d * push * 2 * wi;
566	        x[j] += dx / d * push * 2 * wj; y[j] += dy / d * push * 2 * wj;
567	      }
568	    }
569	    for (let i = 0; i < N; i++) {                       // glass walls, floor and ceiling
570	      const ri = r[i], yMax = GH - 0.85 * ri, yMin = 0.62 * ri;
571	      if (y[i] < yMin) { y[i] = yMin; if (vy[i] < 0) vy[i] = 0; }
572	      if (y[i] > yMax) { y[i] = yMax; if (vy[i] > 0) vy[i] = 0; }
573	      const lim = Math.max(glassHW(Math.min(y[i] + 0.5 * ri, GH)) - 0.88 * ri, 0);
574	      if (x[i] > lim) { x[i] = lim; if (vx[i] > 0) vx[i] = 0; }
575	      else if (x[i] < -lim) { x[i] = -lim; if (vx[i] < 0) vx[i] = 0; }
576	      st[i] += (1 + 0.5 * clamp(Math.abs(vy[i]) / 6, 0, 1) - st[i]) * (1 - Math.exp(-dt / 0.35));
577	    }
578	  };
579	  s.warm = function (secs) { for (let t = 0; t < secs; t += 1 / 30) s.step(1 / 30); };
580	  return s;
581	})();
582	
583	/* ======================================================================
584	   Wax shading. One implementation in JS (CPU renderer and GPU self-test)
585	   and one in GLSL; both evaluate the same metaball field per pixel.
586	   ====================================================================== */
587	const COOL = [0.84, 0.16, 0.30], MID = [1.0, 0.46, 0.14], HOT = [1.0, 0.80, 0.30];
588	const LIQ_TOP = [0.15, 0.06, 0.40], LIQ_BOT = [0.60, 0.18, 0.76], LIQ_OFF = [0.10, 0.09, 0.20];
589	const WAX_OFF = [0.46, 0.21, 0.17], RIM = [1.0, 0.72, 0.55];
590	const LK = [-0.5, 0.6, 0.62], LKN = Math.hypot(LK[0], LK[1], LK[2]);
591	const LKX = LK[0] / LKN, LKY = LK[1] / LKN, LKZ = LK[2] / LKN;
592	const HX = LKX, HY = LKY, HZ = LKZ + 1, HN = Math.hypot(HX, HY, HZ);
593	const HVX = HX / HN, HVY = HY / HN, HVZ = HZ / HN;
594	
595	// o <- premultiplied rgba. f, gx, gy, tw: metaball field, its gradient and temperature-weighted sum.
596	function shade(f, gx, gy, tw, x, y, px, light, o) {

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[tool Read]
{
  "file_path": "[workspace]/index.html",
  "offset": 476,
  "limit": 24
}

[tool result]
476	  g = c.createRadialGradient(kx - 0.5, ky - 0.7, 0.2, kx, ky, kr);
477	  g.addColorStop(0, '#fbfcff'); g.addColorStop(0.55, '#b4b9ca'); g.addColorStop(1, '#6a6f84');
478	  c.fillStyle = g; c.beginPath(); c.arc(kx, ky, kr, 0, TAU); c.fill();
479	  c.fillStyle = 'rgba(0,0,0,0.12)'; c.beginPath(); c.arc(kx, ky, kr * 0.45, 0, TAU); c.fill();
480	}
481	
482	/* ======================================================================
483	   Wax simulation. Blobs are heated by the bulb near the floor, cool near
484	   the top, and are pushed up or down by how warm they are. Touching blobs
485	   cling together, share heat and drift as one; when their temperatures
486	   diverge they stretch apart and pinch off again.
487	   ====================================================================== */
488	const N = 9;
489	const RAD = [6.3, 5.5, 4.9, 4.4, 4.0, 3.6, 3.2, 2.8, 2.5];
490	const K = 2.0;                                         // field radius / blob radius
491	const TH = Math.pow(1 - 1 / (K * K), 3);               // iso-level that makes an isolated blob exactly radius r
492	const DOME = 4.2;
493	
494	const P = {                                             // tuning knobs for the wax physics
495	  heatIn: 0.55, heatLen: 3, heatOut: 1.0, coolLen: 4, runaway: 0.012, driftOff: 0.3,
496	  buoy: 8, sinkK: 0.8, stick: 2.9, resp: 0.65, wander: 0.5, lane: 0.5, laneAmp: 0.85,
497	  repel: 0, repelTo: 0.7, cohesion: 0.15, cohTo: 1.45, slip: 0, hx: 0, couple: 0, minSep: 0.2
498	};
499

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[assistant]
Now I'll rewrite the whole simulation block cleanly, dropping the interaction terms that experiments showed are harmful and adding the new per-blob thermal behavior:

[tool Write]
{
  "file_path": "[workspace]/.t/newsim.js",
  "content": "/* ======================================================================\n   Wax simulation. Each blob has a temperature. Wax touching the hot floor\n   warms up and, once it is hot enough to tear free, rises; near the cool\n   top it loses heat, turns around and sinks back to the pool. Blobs pass\n   through each other, clinging a little: where they overlap the metaball\n   field fuses them into one body, and as they part the neck stretches\n   and pinches off.\n   ====================================================================== */\nconst N = 9;\nconst RAD = [6.3, 5.5, 4.9, 4.4, 4.0, 3.6, 3.2, 2.8, 2.5];\nconst K = 2.0;                                         // field radius / blob radius\nconst TH = Math.pow(1 - 1 / (K * K), 3);               // iso-level that makes an isolated blob exactly radius r\nconst DOME = 4.2;\n\nconst P = {                                             // tuning knobs for the wax physics\n  heatIn: 0.8, heatLen: 3, heatOut: 1.0, coolLen: 4, runaway: 0.012, coolOff: 0.3,\n  buoy: 8, sinkK: 0.8, resp: 0.65, wander: 0.5, lane: 0.5, laneAmp: 0.85,\n  cohesion: 0.15, minSep: 0.2, flat: 0.35\n};\n\nconst sim = (() => {\n  const R = rng(20241028);\n  const f64 = () => new Float64Array(N);\n  const s = {\n    x: f64(), y: f64(), vx: f64(), vy: f64(), r: Float64Array.from(RAD), T: f64(), T0: f64(), st: f64(),\n    ph: f64(), wf: f64(), dl: f64(), hr: f64(), tvx: f64(), tvy: f64(), time: 0, power: 1, heater: 1\n  };\n  for (let i = 0; i < N; i++) {                         // a cold pile on the floor; every blob gets its own character\n    s.x[i] = (R() - 0.5) * 14; s.y[i] = 3 + i * 2.1 + R() * 3; s.T[i] = 0.15 + R() * 0.25;\n    s.T0[i] = 0.44 + R() * 0.14;                        // temperature at which it neither rises nor sinks\n    s.dl[i] = 0.16 + R() * 0.2;                         // extra heat needed to tear free of the floor\n    s.hr[i] = 0.75 + R() * 0.5;                         // how readily it takes up heat\n    s.ph[i] = R() * TAU; s.wf[i] = 0.25 + R() * 0.35; s.st[i] = 1;\n  }\n  s.step = function (dt) {\n    const { x, y, vx, vy, r, T, T0, st, ph, wf, dl, hr, tvx, tvy } = s;\n    const kv = 1 - Math.exp(-dt / P.resp);\n    s.time += dt;\n    s.heater += (s.power - s.heater) * (1 - Math.exp(-dt / (s.power > s.heater ? 1.2 : 2.5)));\n    const W = s.heater;\n    const lag = (1 - W) * P.coolOff, run = W * P.runaway;             // off: wax cools to room temperature; on: no stable hover level\n    for (let i = 0; i < N; i++) {\n      const m = r[i] / 4, yi = y[i];\n      const floor = clamp(1 - (yi - 0.62 * r[i]) / 2.5, 0, 1);        // 1 while resting on the glass floor\n      const heatIn = P.heatIn * hr[i] * W * Math.exp(-yi / P.heatLen);   // only wax touching the hot floor warms up\n      const heatOut = P.heatOut * Math.exp(-(GH - yi) / P.coolLen);      // only wax near the cool top loses its heat\n      const dT = Math.pow(m, -0.7) * (heatIn * (1 - T[i]) - heatOut * T[i]) - lag * T[i] + run * (T[i] - T0[i]);\n      T[i] = clamp(T[i] + dt * dT, 0, 1);\n      // warmer than neutral rises, cooler sinks; on the floor it clings until it is dl hotter than neutral\n      const tear = T0[i] + dl[i] * floor, k = P.buoy * Math.sqrt(m);\n      tvy[i] = T[i] > tear ? (T[i] - tear) * k : T[i] < T0[i] ? (T[i] - T0[i]) * k * P.sinkK : 0;\n      const room = Math.max(glassHW(Math.min(yi + 0.5 * r[i], GH)) - 0.88 * r[i], 0);   // sideways room at this height\n      const lane = P.laneAmp * room * Math.sin(s.time * wf[i] * 0.35 + ph[i] + 1.7);    // each blob meanders in its own lane\n      tvx[i] = P.lane * (lane - x[i]) + P.wander * Math.sin(s.time * wf[i] + ph[i]);\n    }\n    for (let i = 0; i < N; i++) {                       // wax clings to wax just beyond touching, so necks stretch before they break\n      for (let j = i + 1; j < N; j++) {\n        const dx = x[j] - x[i], dy = y[j] - y[i], rs = r[i] + r[j];\n        const d2 = dx * dx + dy * dy;\n        if (d2 > rs * rs * 2.1) continue;\n        const d = Math.sqrt(d2) + 1e-6, q = (d / rs - 0.7) / 0.75;\n        if (q <= 0 || q >= 1) continue;\n        const sp = P.cohesion * Math.sin(Math.PI * q);\n        const mi = r[i] * r[i], mj = r[j] * r[j], wi = mj / (mi + mj), wj = mi / (mi + mj);\n        tvx[i] += dx / d * sp * wi; tvy[i] += dy / d * sp * wi;\n        tvx[j] -= dx / d * sp * wj; tvy[j] -= dy / d * sp * wj;\n      }\n    }\n    for (let i = 0; i < N; i++) {\n      vx[i] += (tvx[i] - vx[i]) * kv; vy[i] += (tvy[i] - vy[i]) * kv;\n      x[i] += vx[i] * dt; y[i] += vy[i] * dt;\n    }\n    for (let i = 0; i < N; i++) {                       // blobs may overlap, but never sit exactly on top of each other\n      for (let j = i + 1; j < N; j++) {\n        const dx = x[j] - x[i], dy = y[j] - y[i], min = P.minSep * (r[i] + r[j]);\n        const d2 = dx * dx + dy * dy;\n        if (d2 >= min * min) continue;\n        const d = Math.sqrt(d2) + 1e-6, push = min - d;\n        const mi = r[i] * r[i], mj = r[j] * r[j], wi = mj / (mi + mj), wj = mi / (mi + mj);\n        x[i] -= dx / d * push * wi; y[i] -= dy / d * push * wi;\n        x[j] += dx / d * push * wj; y[j] += dy / d * push * wj;\n      }\n    }\n    for (let i = 0; i < N; i++) {                       // glass walls, floor and ceiling\n      const ri = r[i], yMax = GH - 0.85 * ri, yMin = 0.62 * ri;\n      if (y[i] < yMin) { y[i] = yMin; if (vy[i] < 0) vy[i] = 0; }\n      if (y[i] > yMax) { y[i] = yMax; if (vy[i] > 0) vy[i] = 0; }\n      const lim = Math.max(glassHW(Math.min(y[i] + 0.5 * ri, GH)) - 0.88 * ri, 0);\n      if (x[i] > lim) { x[i] = lim; if (vx[i] > 0) vx[i] = 0; }\n      else if (x[i] < -lim) { x[i] = -lim; if (vx[i] < 0) vx[i] = 0; }\n      // stretch along the direction of travel; squash wide and flat when resting on the floor\n      const rest = clamp(1 - (y[i] - yMin) / 2.5, 0, 1);\n      const want = (1 + 0.5 * clamp(Math.abs(vy[i]) / 6, 0, 1)) * (1 - P.flat * rest);\n      st[i] += (want - st[i]) * (1 - Math.exp(-dt / 0.35));\n    }\n  };\n  s.warm = function (secs) { for (let t = 0; t < secs; t += 1 / 30) s.step(1 / 30); };\n  return s;\n})();\n"
}

[tool result]
File created successfully at: [workspace]/.t/newsim.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nconst lines=fs.readFileSync('index.html','utf8').split('\\n');\nconst a=lines.findIndex(l=>l.startsWith('   Wax simulation. Blobs are heated'))-1;\nconst b=lines.findIndex(l=>l.startsWith('   Wax shading. One implementation'))-1;\nif(a<0||b<0||!lines[a].startsWith('/* ====')||!lines[b].startsWith('/* ====')) throw new Error('markers '+a+' '+b);\nconst nb=fs.readFileSync('.t/newsim.js','utf8').replace(/\\n$/,'').split('\\n');\nlines.splice(a,b-a,...nb,'');\nfs.writeFileSync('index.html',lines.join('\\n'));\nconsole.log('replaced',a+1,'..',b,'with',nb.length);\n\" 2>&1 | head; node .t/warmup.js 2>&1 | head -30",
  "description": "Splice new sim and re-test wake-up behavior",
  "timeout": 120000
}

[tool error]
Exit code 1
replaced 482 .. 582 with 99
after 90 s off: y = 4 3 3 3 2 2 2 2 2  T = 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
t(on) | blobs above y=12 | highest | moving (|vy|>1)
   0  |  0  |  4  |  1
   3  |  0  |  4  |  1
   6  |  0  |  6  |  3
   9  |  0  |  12  |  7
  12  |  7  |  22  |  7
  15  |  8  |  32  |  9
  18  |  9  |  42  |  9
  21  |  9  |  53  |  9
  24  |  9  |  63  |  9
  27  |  9  |  69  |  7
  30  |  9  |  68  |  7
  33  |  9  |  67  |  8
  36  |  9  |  66  |  8
  39  |  9  |  63  |  8
  42  |  9  |  60  |  9
  45  |  9  |  55  |  9
  48  |  9  |  51  |  9
  51  |  9  |  46  |  9
  54  |  6  |  41  |  9
  57  |  1  |  36  |  7
  60  |  1  |  31  |  3
zsh:11: operation not permitted: [redacted:local-path]

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[thinking]
The first lift now occurs at 6–9 s, but the blobs still leave in a tight cluster. I'll widen the per-blob variation in tear-off temperature and heating rate, then verify the steady state remains stable.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "    s.dl[i] = 0.16 + R() * 0.2;                         // extra heat needed to tear free of the floor\n    s.hr[i] = 0.75 + R() * 0.5;                         // how readily it takes up heat",
  "new_string": "    s.dl[i] = 0.12 + R() * 0.28;                        // extra heat needed to tear free of the floor\n    s.hr[i] = 0.6 + R() * 0.8;                          // how readily it takes up heat"
}

[tool Bash]
{
  "command": "node .t/warmup.js 2>&1 | head -16; node .t/simlab.js '{}' '{\"T\":600}' 2>&1 | head -3",
  "description": "Check wake-up stagger and steady-state health",
  "timeout": 300000
}

[tool result]
The file [workspace]/index.html has been updated successfully. (note: the file had been modified on disk since you last read it — the edit applied cleanly, but the file contains other changes not in your context. Read it before edits that depend on surrounding content.)

[tool error]
Exit code 1
after 90 s off: y = 4 3 3 3 3 2 2 2 2  T = 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
t(on) | blobs above y=12 | highest | moving (|vy|>1)
   0  |  0  |  4  |  1
   3  |  0  |  4  |  1
   6  |  0  |  5  |  3
   9  |  2  |  14  |  7
  12  |  7  |  23  |  8
  15  |  8  |  33  |  9
  18  |  9  |  43  |  9
  21  |  9  |  53  |  9
  24  |  9  |  63  |  9
  27  |  9  |  69  |  6
  30  |  9  |  68  |  5
  33  |  9  |  67  |  8
  36  |  9  |  65  |  8
  39  |  9  |  59  |  9
components 4.39  merges/min 24.9  splits/min 24.9  moving 85%  y-hist(10u bins) 19,13,13,13,13,14,16  nan false
y range per blob: 4-67 3-67 3-68 3-68 2-69 2-68 2-67 3-67 3-67
zsh:1: operation not permitted: [redacted:local-path]

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[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "    s.dl[i] = 0.12 + R() * 0.28;                        // extra heat needed to tear free of the floor",
  "new_string": "    s.dl[i] = 0.08 + R() * 0.32;                        // extra heat needed to tear free of the floor"
}

[tool Bash]
{
  "command": "node .t/warmup.js 2>&1 | head -14; node .t/simlab.js '{}' '{\"T\":600}' 2>&1 | head -3",
  "description": "Re-check wake-up and steady state",
  "timeout": 300000
}

[tool result]
The file [workspace]/index.html has been updated successfully.

[tool error]
Exit code 1
after 90 s off: y = 4 3 3 3 3 2 2 2 2  T = 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
t(on) | blobs above y=12 | highest | moving (|vy|>1)
   0  |  0  |  4  |  1
   3  |  0  |  4  |  1
   6  |  0  |  6  |  4
   9  |  3  |  14  |  7
  12  |  7  |  24  |  7
  15  |  8  |  33  |  9
  18  |  9  |  43  |  9
  21  |  9  |  53  |  9
  24  |  9  |  62  |  9
  27  |  9  |  69  |  7
  30  |  9  |  68  |  7
  33  |  9  |  66  |  8
components 4.64  merges/min 26.9  splits/min 27.0  moving 86%  y-hist(10u bins) 19,13,13,13,13,14,15  nan false
y range per blob: 4-67 3-67 3-68 3-68 2-69 2-68 2-67 3-66 2-67
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
Wake-up timing looks right now: warming and color change start immediately, the first wax breaks free around 6s, and the rest follow within ten seconds. I'll review this sequence visually, starting from a fully cold pool after 60s off.

[tool Write]
{
  "file_path": "[workspace]/.t/sheet_on.js",
  "content": "'use strict';\n// Off for N seconds, then switch on and capture a contact sheet at the given offsets after switching on.\nconst { createPage } = require('./harness.js');\nconst { stitch } = require('./sheet.js');\nconst offFor = +process.argv[2] || 60;\nconst times = (process.argv[3] || '0.3,2,5,8,11,15').split(',').map(Number);\nconst name = process.argv[4] || 'sheet_on.png';\nconst page = createPage({ vw: 390, vh: 844, dpr: 1.5 });\npage.click();\npage.frames(Math.round(offFor * 60));\npage.click();\nconst imgs = [];\nlet t = 0;\nfor (const target of times) {\n  const frames = Math.round((target - t) * 60);\n  if (frames > 0) page.frames(frames);\n  t = target;\n  imgs.push(page.shot('tmp.png', 1.1, { x: 80, y: 270, w: 230, h: 380 }));\n}\nstitch(imgs, name);\nconsole.log('wrote', name);\n"
}

[tool Bash]
{
  "command": "node .t/sheet_on.js 60 0.3,2,5,8,11,15 sheet_on.png 2>&1 | head -3",
  "description": "Render switch-on sequence from cold pool",
  "timeout": 300000
}

[tool result]
File created successfully at: [workspace]/.t/sheet_on.js (file state is current in your context — no need to Read it back)

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01BBG8EjBHDwLgFau1RFRXMS-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01BBG8EjBHDwLgFau1RFRXMS","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"d64108a8-26f4-4761-a542-f36016ce1aa7"}

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01BBG8EjBHDwLgFau1RFRXMS-heartbeat-1","tool_name":"Bash","parent_tool_use_id":"toolu_01BBG8EjBHDwLgFau1RFRXMS","elapsed_time_seconds":60,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"c37132f4-a52d-44ad-a617-60b81a5fb40c"}

[system]
task_notification

[tool error]
Exit code 1
wrote sheet_on.png
zsh:1: operation not permitted: [redacted:local-path]

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[tool Read]
{
  "file_path": "[workspace]/.t/out/sheet_on.png"
}

[tool result]
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[thinking]
The switch-on sequence checks out—the wax transitions correctly from cold crimson to hot yellow as droplets form and merge. Now I'll zoom in on the fixed areas: the glass-to-cap and glass-to-base junctions, plus the edge glow.

[tool Bash]
{
  "command": "node .t/crop.js 390 844 3 12 z_top.png 90 260 210 150 4 2>&1 | head -2; node .t/crop.js 390 844 3 12 z_bot.png 70 560 250 130 4 2>&1 | head -2",
  "description": "Zoomed crops of cap and base junctions",
  "timeout": 300000
}

[system]
task_started

[system]
task_notification

[tool error]
Exit code 1
wrote z_top.png
wrote z_bot.png
zsh:1: operation not permitted: [redacted:local-path]

[system]
status

[tool Read]
{
  "file_path": "[workspace]/.t/out/z_top.png"
}

[tool result]
[image]

[tool Read]
{
  "file_path": "[workspace]/.t/out/z_bot.png"
}

[tool result]
[image]

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[thinking]
The junctions look clean now, with the glass blending smoothly into the cap and base. Next I'll trim the rim glow ends, add `prefers-reduced-motion` support, and swap the SVG favicon for an embedded PNG to avoid its xmlns URL tripping a no-external-URL check.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "    c.beginPath(); c.ellipse(CX, BASE_TOP, baseHW(BASE_TOP), RIM_RY, 0, 0, Math.PI, false);\n    c.strokeStyle = `rgba(${col},${a})`; c.lineWidth = w; c.stroke();\n  };",
  "new_string": "    c.beginPath(); c.ellipse(CX, BASE_TOP, baseHW(BASE_TOP) - 0.5, RIM_RY, 0, 0.08, Math.PI - 0.08, false);\n    c.strokeStyle = `rgba(${col},${a})`; c.lineWidth = w; c.stroke();\n  };"
}

[tool result]
The file [workspace]/index.html has been updated successfully.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "  const dtRaw = last ? (t - last) / 1000 : 1 / 60;\n  last = t;\n  const dt = clamp(dtRaw, 0, 0.1);\n\n  if (relayoutPending) { relayoutPending = false; relayout(); }\n  adaptQuality(dtRaw);\n\n  const n = Math.max(1, Math.ceil(dt * 90)), h = dt / n;\n  for (let i = 0; i < n; i++) sim.step(h);",
  "new_string": "  const dtRaw = last ? (t - last) / 1000 : 1 / 60;\n  last = t;\n  const dt = clamp(dtRaw, 0, 0.1);\n\n  if (relayoutPending) { relayoutPending = false; relayout(); }\n  adaptQuality(dtRaw);\n\n  const sdt = calm && calm.matches ? dt * 0.5 : dt;       // reduced-motion preference: half-speed wax\n  const n = Math.max(1, Math.ceil(sdt * 90)), h = sdt / n;\n  for (let i = 0; i < n; i++) sim.step(h);"
}

[tool result]
The file [workspace]/index.html has been updated successfully.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "let wax = null, waxQual = 1, swPos = 1, light = 1, dirty = true;\n\nfunction place(",
  "new_string": "let wax = null, waxQual = 1, swPos = 1, light = 1, dirty = true;\nconst calm = win.matchMedia ? win.matchMedia('(prefers-reduced-motion: reduce)') : null;\n\nfunction place("
}

[tool result]
The file [workspace]/index.html has been updated successfully.

[tool Write]
{
  "file_path": "[workspace]/.t/mkicon.js",
  "content": "'use strict';\n// Draws the favicon with the mock canvas and prints it as a base64 PNG (so the page needs no URL of any kind).\nconst { MockCanvas, writePNG } = require('./mock2d.js');\nconst fs = require('fs');\nconst S = 64;\nconst cv = new MockCanvas(S, S);\nconst c = cv.getContext('2d');\nc.setTransform(S / 32, 0, 0, S / 32, 0, 0);\nfunction rr(x, y, w, h, r) { c.beginPath(); c.moveTo(x + r, y); c.arc(x + w - r, y + r, r, -Math.PI / 2, 0); c.arc(x + w - r, y + h - r, r, 0, Math.PI / 2); c.arc(x + r, y + h - r, r, Math.PI / 2, Math.PI); c.arc(x + r, y + r, r, Math.PI, Math.PI * 1.5); c.closePath(); }\nlet g = c.createLinearGradient(0, 0, 0, 32);\ng.addColorStop(0, '#1d2145'); g.addColorStop(1, '#0d0f24');\nrr(0, 0, 32, 32, 7); c.fillStyle = g; c.fill();\n// glass\ng = c.createLinearGradient(0, 5, 0, 24);\ng.addColorStop(0, '#5a2bb0'); g.addColorStop(1, '#a24be0');\nc.beginPath(); c.moveTo(13, 6); c.lineTo(19, 6); c.lineTo(23.5, 23); c.lineTo(8.5, 23); c.closePath(); c.fillStyle = g; c.fill();\n// wax\ng = c.createRadialGradient(15, 17, 0.5, 16, 18, 4.6);\ng.addColorStop(0, '#ffe27a'); g.addColorStop(1, '#ff7a2a');\nc.beginPath(); c.arc(16, 18.2, 4.1, 0, Math.PI * 2); c.fillStyle = g; c.fill();\nc.beginPath(); c.arc(15.2, 10.6, 1.9, 0, Math.PI * 2); c.fillStyle = '#ff9a3a'; c.fill();\n// cap + base\nc.fillStyle = '#c4c8d8'; c.beginPath(); c.moveTo(12, 6); c.lineTo(13.4, 3); c.lineTo(18.6, 3); c.lineTo(20, 6); c.closePath(); c.fill();\nc.fillStyle = '#9aa0b6'; c.beginPath(); c.moveTo(8, 22.5); c.lineTo(24, 22.5); c.lineTo(27, 28); c.lineTo(5, 28); c.closePath(); c.fill();\nc.fillStyle = 'rgba(255,255,255,0.35)'; c.fillRect(8, 22.5, 16, 0.8);\nconst px = cv._buf, rgba = new Uint8Array(S * S * 4);\nfor (let i = 0; i < S * S; i++) {\n  const a = px[i * 4 + 3];\n  rgba[i * 4] = a ? Math.round(px[i * 4] / a * 255) : 0; rgba[i * 4 + 1] = a ? Math.round(px[i * 4 + 1] / a * 255) : 0;\n  rgba[i * 4 + 2] = a ? Math.round(px[i * 4 + 2] / a * 255) : 0; rgba[i * 4 + 3] = Math.round(a * 255);\n}\nwritePNG(__dirname + '/out/icon.png', S, S, rgba);\nfs.writeFileSync(__dirname + '/out/icon.b64', fs.readFileSync(__dirname + '/out/icon.png').toString('base64'));\nconsole.log('icon bytes', fs.statSync(__dirname + '/out/icon.png').size, 'base64 chars', fs.readFileSync(__dirname + '/out/icon.b64', 'utf8').length);\n"
}

[tool result]
File created successfully at: [workspace]/.t/mkicon.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/mkicon.js 2>&1 | head -3",
  "description": "Generate favicon PNG as base64"
}

[tool error]
Exit code 1
icon bytes 2064 base64 chars 2752
zsh:1: operation not permitted: [redacted:local-path]

[system]
status

[tool Read]
{
  "file_path": "[workspace]/.t/out/icon.png"
}

[tool result]
[image]

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[assistant]
The icon reads fine at tiny size. I'll embed it, replacing the SVG favicon line.

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet h=fs.readFileSync('index.html','utf8');\nconst b64=fs.readFileSync('.t/out/icon.b64','utf8').trim();\nconst re=/\\n');\nfs.writeFileSync('index.html',h);\nconsole.log('ok; file bytes', h.length);\n\" 2>&1 | head -3; grep -c \"http\" index.html",
  "description": "Embed PNG favicon and count remaining 'http' occurrences"
}

[tool result]
ok; file bytes 55788
0

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[thinking]
No external URLs remain in the file. Since I can't test the WebGL path directly, I'll build a small GLSL ES 1.00 interpreter in Node to type-check and execute the exact shader source, comparing its output pixel-by-pixel against the JS reference implementation.

[tool Write]
{
  "file_path": "[workspace]/.t/glsl.js",
  "content": "'use strict';\n// A small GLSL ES 1.00 interpreter (the subset the lamp's fragment shader uses) with a strict type checker,\n// so the shader source can be validated and executed in Node without a GPU.\n\nconst TYPES = new Set(['void', 'float', 'int', 'bool', 'vec2', 'vec3', 'vec4']);\nconst VEC = { vec2: 2, vec3: 3, vec4: 4 };\nconst PREC = new Set(['highp', 'mediump', 'lowp']);\nconst QUAL = new Set(['const', 'uniform', 'varying', 'attribute']);\n\nclass GLSLError extends Error {}\nconst fail = (msg, tok) => { throw new GLSLError(msg + (tok && tok.line ? ` (line ${tok.line})` : '')); };\n\nfunction preprocess(src, defines) {\n  const defs = Object.assign({}, defines);\n  const out = [];\n  const stack = [];                      // each: {active, taken}\n  let active = true;\n  const lines = src.replace(/\\/\\*[\\s\\S]*?\\*\\//g, m => m.replace(/[^\\n]/g, ' ')).split('\\n');\n  lines.forEach((raw, n) => {\n    const line = raw.replace(/\\/\\/.*$/, '');\n    const m = /^\\s*#\\s*(\\w+)\\s*(.*)$/.exec(line);\n    if (m) {\n      const [, dir, rest] = m;\n      if (dir === 'ifdef' || dir === 'ifndef') {\n        const isDef = Object.prototype.hasOwnProperty.call(defs, rest.trim());\n        const take = dir === 'ifdef' ? isDef : !isDef;\n        stack.push({ outer: active, taken: take });\n        active = active && take;\n      } else if (dir === 'else') {\n        const top = stack[stack.length - 1];\n        if (!top) fail('#else without #if', { line: n + 1 });\n        active = top.outer && !top.taken;\n      } else if (dir === 'endif') {\n        const top = stack.pop();\n        if (!top) fail('#endif without #if', { line: n + 1 });\n        active = top.outer;\n      } else if (active && dir === 'define') {\n        const dm = /^(\\w+)\\s*(.*)$/.exec(rest);\n        if (!dm) fail('bad #define', { line: n + 1 });\n        if (/^\\w+\\(/.test(rest)) fail('function-like macros not supported', { line: n + 1 });\n        defs[dm[1]] = dm[2].trim();\n      } else if (active && dir !== 'version' && dir !== 'extension') fail('unsupported directive #' + dir, { line: n + 1 });\n      out.push('');\n    } else out.push(active ? line : '');\n  });\n  if (stack.length) fail('unterminated #if');\n  return { text: out.join('\\n'), defs };\n}\n\nfunction lex(text, defs) {\n  const toks = [];\n  const re = /\\s+|([A-Za-z_]\\w*)|(\\d+\\.\\d*(?:[eE][+-]?\\d+)?|\\.\\d+(?:[eE][+-]?\\d+)?|\\d+[eE][+-]?\\d+|\\d+)|(\\+\\+|--|\\+=|-=|\\*=|\\/=|==|!=|<=|>=|&&|\\|\\||\\^\\^|[-+*\\/%<>=!?:;,.(){}\\[\\]])|(.)/gy;\n  let line = 1, m;\n  const pushTok = (t, depth) => {\n    if (t.t === 'id' && Object.prototype.hasOwnProperty.call(defs, t.v) && depth < 8) {\n      for (const s of lex(defs[t.v], depth ? {} : defs)) pushTok(Object.assign({}, s, { line: t.line }), depth + 1);\n    } else toks.push(t);\n  };\n  while (re.lastIndex < text.length && (m = re.exec(text))) {\n    if (m[0].trim() === '') { line += (m[0].match(/\\n/g) || []).length; continue; }\n    if (m[1]) pushTok({ t: 'id', v: m[1], line }, 0);\n    else if (m[2]) pushTok({ t: 'num', v: parseFloat(m[2]), isFloat: /[.eE]/.test(m[2]), line }, 0);\n    else if (m[3]) pushTok({ t: 'op', v: m[3], line }, 0);\n    else fail('unexpected character ' + JSON.stringify(m[4]), { line });\n  }\n  return toks;\n}\n\nclass Parser {\n  constructor(toks) { this.toks = toks; this.i = 0; }\n  peek(o = 0) { return this.toks[this.i + o]; }\n  next() { return this.toks[this.i++]; }\n  isOp(v, o = 0) { const t = this.peek(o); return t && t.t === 'op' && t.v === v; }\n  isId(v, o = 0) { const t = this.peek(o); return t && t.t === 'id' && t.v === v; }\n  expectOp(v) { const t = this.next(); if (!t || t.t !== 'op' || t.v !== v) fail(`expected '${v}' but found '${t ? t.v : 'end of file'}'`, t || this.toks[this.toks.length - 1]); return t; }\n  ident() { const t = this.next(); if (!t || t.t !== 'id') fail('expected identifier', t); return t; }\n  isType(o = 0) { const t = this.peek(o); return t && t.t === 'id' && TYPES.has(t.v); }\n\n  program() {\n    const decls = [];\n    while (this.peek()) decls.push(this.topLevel());\n    return decls;\n  }\n  topLevel() {\n    const t = this.peek();\n    if (this.isId('precision')) {\n      this.next(); const p = this.ident(); if (!PREC.has(p.v)) fail('bad precision', p);\n      const ty = this.ident(); this.expectOp(';');\n      return { k: 'precision', ty: ty.v, line: t.line };\n    }\n    let qual = null;\n    if (t.t === 'id' && QUAL.has(t.v)) { qual = this.next().v; }\n    if (this.peek().t === 'id' && PREC.has(this.peek().v)) this.next();\n    if (!this.isType()) fail(`expected a type but found '${this.peek().v}'`, this.peek());\n    const ty = this.next().v;\n    const name = this.ident();\n    if (this.isOp('(')) return this.funcRest(ty, name);\n    // global variable(s)\n    const vars = [];\n    let nm = name;\n    for (;;) {\n      let size = null;\n      if (this.isOp('[')) { this.next(); size = this.expr(); this.expectOp(']'); }\n      let init = null;\n      if (this.isOp('=')) { this.next(); init = this.assign(); }\n      vars.push({ name: nm.v, size, init, line: nm.line });\n      if (this.isOp(',')) { this.next(); nm = this.ident(); continue; }\n      break;\n    }\n    this.expectOp(';');\n    return { k: 'globals', qual, ty, vars, line: t.line };\n  }\n  funcRest(ret, name) {\n    this.expectOp('(');\n    const params = [];\n    if (!this.isOp(')')) {\n      if (this.isId('void') && this.isOp(')', 1)) this.next();\n      else for (;;) {\n        while (this.peek().t === 'id' && (['in', 'out', 'inout', 'const'].includes(this.peek().v) || PREC.has(this.peek().v))) this.next();\n        if (!this.isType()) fail('expected parameter type', this.peek());\n        const ty = this.next().v; const pn = this.ident();\n        params.push({ ty, name: pn.v });\n        if (this.isOp(',')) { this.next(); continue; }\n        break;\n      }\n    }\n    this.expectOp(')');\n    const body = this.block();\n    return { k: 'func', ret, name: name.v, params, body, line: name.line };\n  }\n  block() {\n    const open = this.expectOp('{');\n    const body = [];\n    while (!this.isOp('}')) { if (!this.peek()) fail('unterminated block', open); body.push(this.stmt()); }\n    this.next();\n    return { k: 'block', body };\n  }\n  stmt() {\n    const t = this.peek();\n    if (this.isOp('{')) return this.block();\n    if (this.isId('if')) {\n      this.next(); this.expectOp('('); const c = this.expr(); this.expectOp(')');\n      const a = this.stmt(); let b = null;\n      if (this.isId('else')) { this.next(); b = this.stmt(); }\n      return { k: 'if', c, a, b, line: t.line };\n    }\n    if (this.isId('for')) {\n      this.next(); this.expectOp('(');\n      const init = this.isOp(';') ? null : this.declOrExpr(); this.expectOp(';');\n      const cond = this.isOp(';') ? null : this.expr(); this.expectOp(';');\n      const inc = this.isOp(')') ? null : this.expr(); this.expectOp(')');\n      return { k: 'for', init, cond, inc, body: this.stmt(), line: t.line };\n    }\n    if (this.isId('return')) { this.next(); const v = this.isOp(';') ? null : this.expr(); this.expectOp(';'); return { k: 'return', v, line: t.line }; }\n    if (this.isId('discard')) { this.next(); this.expectOp(';'); return { k: 'discard', line: t.line }; }\n    if (this.isId('break') || this.isId('continue')) { const w = this.next().v; this.expectOp(';'); return { k: w, line: t.line }; }\n    const s = this.declOrExpr(); this.expectOp(';');\n    return s;\n  }\n  declOrExpr() {\n    const t = this.peek();\n    let isConst = false, o = 0;\n    if (this.isId('const')) { isConst = true; o = 1; }\n    if (this.peek(o) && this.peek(o).t === 'id' && PREC.has(this.peek(o).v)) o++;\n    if (this.isType(o) && this.peek(o + 1) && this.peek(o + 1).t === 'id' && !this.isOp('(', o + 1)) {\n      this.i += o;\n      const ty = this.next().v;\n      const vars = [];\n      for (;;) {\n        const nm = this.ident();\n        if (this.isOp('[')) fail('local arrays are not supported by this checker', nm);\n        let init = null;\n        if (this.isOp('=')) { this.next(); init = this.assign(); }\n        vars.push({ name: nm.v, init, line: nm.line });\n        if (this.isOp(',')) { this.next(); continue; }\n        break;\n      }\n      return { k: 'decl', ty, vars, isConst, line: t.line };\n    }\n    return { k: 'expr', e: this.expr(), line: t.line };\n  }\n  expr() { return this.assign(); }\n  assign() {\n    const l = this.ternary();\n    const t = this.peek();\n    if (t && t.t === 'op' && ['=', '+=', '-=', '*=', '/='].includes(t.v)) {\n      this.next();\n      return { k: 'assign', op: t.v, l, r: this.assign(), line: t.line };\n    }\n    return l;\n  }\n  ternary() {\n    const c = this.bin(0);\n    if (this.isOp('?')) {\n      const t = this.next();\n      const a = this.expr(); this.expectOp(':'); const b = this.assign();\n      return { k: 'cond', c, a, b, line: t.line };\n    }\n    return c;\n  }\n  bin(level) {\n    const LV = [['||'], ['^^'], ['&&'], ['==', '!='], ['<', '>', '<=', '>='], ['+', '-'], ['*', '/']];\n    if (level >= LV.length) return this.unary();\n    let l = this.bin(level + 1);\n    for (;;) {\n      const t = this.peek();\n      if (t && t.t === 'op' && LV[level].includes(t.v)) { this.next(); l = { k: 'bin', op: t.v, l, r: this.bin(level + 1), line: t.line }; }\n      else return l;\n    }\n  }\n  unary() {\n    const t = this.peek();\n    if (t && t.t === 'op' && ['-', '+', '!'].includes(t.v)) { this.next(); return { k: 'unary', op: t.v, e: this.unary(), line: t.line }; }\n    if (t && t.t === 'op' && (t.v === '++' || t.v === '--')) fail('increment operators are only supported in loop headers', t);\n    return this.postfix();\n  }\n  postfix() {\n    let e = this.primary();\n    for (;;) {\n      if (this.isOp('.')) { const t = this.next(); const f = this.ident(); e = { k: 'field', e, f: f.v, line: t.line }; }\n      else if (this.isOp('[')) { const t = this.next(); const i = this.expr(); this.expectOp(']'); e = { k: 'index', e, i, line: t.line }; }\n      else if (this.isOp('++') || this.isOp('--')) { const t = this.next(); e = { k: 'post', op: t.v, e, line: t.line }; }\n      else return e;\n    }\n  }\n  primary() {\n    const t = this.next();\n    if (!t) fail('unexpected end of file');\n    if (t.t === 'num') return { k: 'num', v: t.v, isFloat: t.isFloat, line: t.line };\n    if (t.t === 'op' && t.v === '(') { const e = this.expr(); this.expectOp(')'); return e; }\n    if (t.t === 'id') {\n      if (this.isOp('(')) {\n        this.next();\n        const args = [];\n        if (!this.isOp(')')) for (;;) { args.push(this.assign()); if (this.isOp(',')) { this.next(); continue; } break; }\n        this.expectOp(')');\n        return { k: TYPES.has(t.v) ? 'ctor' : 'call', name: t.v, args, line: t.line };\n      }\n      if (t.v === 'true' || t.v === 'false') return { k: 'bool', v: t.v === 'true', line: t.line };\n      return { k: 'var', name: t.v, line: t.line };\n    }\n    fail(`unexpected '${t.v}'`, t);\n  }\n}\n\n/* ---------------- built-ins (genType = float | vec2 | vec3 | vec4) ---------------- */\nconst GEN = ['float', 'vec2', 'vec3', 'vec4'];\nconst map1 = f => a => (typeof a === 'number' ? f(a) : a.map(f));\nconst map2 = f => (a, b) => (typeof a === 'number' ? f(a, b) : a.map((v, i) => f(v, typeof b === 'number' ? b : b[i])));\nconst clamp1 = (x, a, b) => Math.min(Math.max(x, a), b);\nconst BUILTIN = {\n  abs: { sig: t => GEN.includes(t[0]) && t.length === 1 ? t[0] : null, f: map1(Math.abs) },\n  sqrt: { sig: t => GEN.includes(t[0]) && t.length === 1 ? t[0] : null, f: map1(Math.sqrt) },\n  exp: { sig: t => GEN.includes(t[0]) && t.length === 1 ? t[0] : null, f: map1(Math.exp) },\n  sin: { sig: t => GEN.includes(t[0]) && t.length === 1 ? t[0] : null, f: map1(Math.sin) },\n  cos: { sig: t => GEN.includes(t[0]) && t.length === 1 ? t[0] : null, f: map1(Math.cos) },\n  floor: { sig: t => GEN.includes(t[0]) && t.length === 1 ? t[0] : null, f: map1(Math.floor) },\n  pow: { sig: t => t.length === 2 && GEN.includes(t[0]) && t[1] === t[0] ? t[0] : null, f: (a, b) => (typeof a === 'number' ? Math.pow(a, b) : a.map((v, i) => Math.pow(v, b[i]))) },\n  min: { sig: t => t.length === 2 && GEN.includes(t[0]) && (t[1] === t[0] || t[1] === 'float') ? t[0] : null, f: map2(Math.min) },\n  max: { sig: t => t.length === 2 && GEN.includes(t[0]) && (t[1] === t[0] || t[1] === 'float') ? t[0] : null, f: map2(Math.max) },\n  clamp: { sig: t => t.length === 3 && GEN.includes(t[0]) && ((t[1] === t[0] && t[2] === t[0]) || (t[1] === 'float' && t[2] === 'float')) ? t[0] : null,\n    f: (x, a, b) => (typeof x === 'number' ? clamp1(x, a, b) : x.map((v, i) => clamp1(v, typeof a === 'number' ? a : a[i], typeof b === 'number' ? b : b[i]))) },\n  mix: { sig: t => t.length === 3 && GEN.includes(t[0]) && t[1] === t[0] && (t[2] === t[0] || t[2] === 'float') ? t[0] : null,\n    f: (x, y, a) => (typeof x === 'number' ? x * (1 - a) + y * a : x.map((v, i) => { const k = typeof a === 'number' ? a : a[i]; return v * (1 - k) + y[i] * k; })) },\n  smoothstep: { sig: t => t.length === 3 && GEN.includes(t[2]) && ((t[0] === 'float' && t[1] === 'float') || (t[0] === t[2] && t[1] === t[2])) ? t[2] : null,\n    f: (e0, e1, x) => { const s = v => { const q = clamp1((v - e0) / (e1 - e0), 0, 1); return q * q * (3 - 2 * q); }; return typeof x === 'number' ? s(x) : x.map(s); } },\n  length: { sig: t => t.length === 1 && GEN.includes(t[0]) ? 'float' : null, f: a => (typeof a === 'number' ? Math.abs(a) : Math.sqrt(a.reduce((s, v) => s + v * v, 0))) },\n  dot: { sig: t => t.length === 2 && GEN.includes(t[0]) && t[1] === t[0] ? 'float' : null, f: (a, b) => (typeof a === 'number' ? a * b : a.reduce((s, v, i) => s + v * b[i], 0)) },\n  normalize: { sig: t => t.length === 1 && GEN.includes(t[0]) ? t[0] : null, f: a => { const l = Math.sqrt(a.reduce((s, v) => s + v * v, 0)); return a.map(v => v / l); } }\n};\n\n/* ---------------- type checking ---------------- */\nfunction typeCheck(decls, opts) {\n  const globals = new Map();            // name -> {ty, qual, size}\n  const funcs = new Map();\n  let precisionFloat = false;\n  const bi = (name) => BUILTIN[name];\n  const comps = ty => VEC[ty] || 1;\n  const scalarOf = ty => (VEC[ty] ? 'float' : ty);\n\n  function arith(op, ta, tb, line) {\n    const tok = { line };\n    const isNum = t => t === 'float' || t === 'int' || VEC[t];\n    if (!isNum(ta) || !isNum(tb)) fail(`'${op}': operands must be numeric (got ${ta}, ${tb})`, tok);\n    if (ta === tb) return ta;\n    if (VEC[ta] && tb === 'float') return ta;\n    if (VEC[tb] && ta === 'float') return tb;\n    fail(`'${op}': no implicit conversion between ${ta} and ${tb}`, tok);\n  }\n\n  function checkExpr(e, scope, fnCtx) {\n    const t = (ty) => (e.ty = ty);\n    switch (e.k) {\n      case 'num': return t(e.isFloat ? 'float' : 'int');\n      case 'bool': return t('bool');\n      case 'var': {\n        const loc = scope.lookup(e.name);\n        if (loc) { e.ref = { local: true, id: loc.id }; return t(loc.ty); }\n        if (e.name === 'gl_FragColor') { e.ref = { global: 'gl_FragColor' }; return t('vec4'); }\n        if (e.name === 'gl_FragCoord') { e.ref = { global: 'gl_FragCoord' }; return t('vec4'); }\n        const g = globals.get(e.name);\n        if (!g) fail(`undeclared identifier '${e.name}'`, e);\n        e.ref = { global: e.name, array: g.size };\n        e.isArray = g.size != null;\n        return t(g.ty);\n      }\n      case 'unary': {\n        const a = checkExpr(e.e, scope, fnCtx);\n        if (e.op === '!') { if (a !== 'bool') fail(\"'!' needs a bool\", e); return t('bool'); }\n        if (!(a === 'float' || a === 'int' || VEC[a])) fail(`unary '${e.op}' needs a numeric operand`, e);\n        return t(a);\n      }\n      case 'bin': {\n        const a = checkExpr(e.l, scope, fnCtx), b = checkExpr(e.r, scope, fnCtx);\n        if (['&&', '||', '^^'].includes(e.op)) { if (a !== 'bool' || b !== 'bool') fail(`'${e.op}' needs bool operands`, e); return t('bool'); }\n        if (['<', '>', '<=', '>='].includes(e.op)) { if (a !== b || !(a === 'float' || a === 'int')) fail(`'${e.op}' needs matching scalar operands (got ${a}, ${b})`, e); return t('bool'); }\n        if (['==', '!='].includes(e.op)) { if (a !== b) fail(`'${e.op}' needs matching operands (got ${a}, ${b})`, e); return t('bool'); }\n        return t(arith(e.op, a, b, e.line));\n      }\n      case 'cond': {\n        const c = checkExpr(e.c, scope, fnCtx), a = checkExpr(e.a, scope, fnCtx), b = checkExpr(e.b, scope, fnCtx);\n        if (c !== 'bool') fail('condition of ?: must be bool', e);\n        if (a !== b) fail(`?: branches must have the same type (got ${a}, ${b})`, e);\n        return t(a);\n      }\n      case 'assign': {\n        if (e.l.k !== 'var') fail('only plain variables can be assigned in this checker', e);\n        const l = checkExpr(e.l, scope, fnCtx), r = checkExpr(e.r, scope, fnCtx);\n        if (e.l.ref.global && !['gl_FragColor'].includes(e.l.ref.global) && globals.get(e.l.ref.global) && ['uniform', 'varying', 'const'].includes(globals.get(e.l.ref.global).qual)) fail(`cannot assign to ${globals.get(e.l.ref.global).qual} '${e.l.name}'`, e);\n        if (e.l.ref.local && scope.lookup(e.l.name).isConst) fail(`cannot assign to const '${e.l.name}'`, e);\n        if (e.op === '=') { if (l !== r) fail(`cannot assign ${r} to ${l}`, e); }\n        else { const res = arith(e.op[0], l, r, e.line); if (res !== l) fail(`'${e.op}' would change the type of the left side (${l} -> ${res})`, e); }\n        return t(l);\n      }\n      case 'field': {\n        const a = checkExpr(e.e, scope, fnCtx);\n        if (!VEC[a]) fail(`cannot take .${e.f} of ${a}`, e);\n        const n = VEC[a], set = 'xyzw'.slice(0, n);\n        if (!/^[xyzw]{1,4}$/.test(e.f) || [...e.f].some(ch => !set.includes(ch))) fail(`invalid swizzle .${e.f} on ${a}`, e);\n        e.idx = [...e.f].map(ch => 'xyzw'.indexOf(ch));\n        return t(e.f.length === 1 ? 'float' : 'vec' + e.f.length);\n      }\n      case 'index': {\n        if (e.e.k !== 'var') fail('only arrays can be indexed', e);\n        const a = checkExpr(e.e, scope, fnCtx);\n        if (!e.e.isArray) fail(`'${e.e.name}' is not an array`, e);\n        const i = checkExpr(e.i, scope, fnCtx);\n        if (i !== 'int') fail('array index must be an int', e);\n        return t(a);\n      }\n      case 'ctor': {\n        const tys = e.args.map(a => checkExpr(a, scope, fnCtx));\n        if (!tys.length) fail(`${e.name}() needs arguments`, e);\n        if (e.name === 'float' || e.name === 'int' || e.name === 'bool') {\n          if (tys.length !== 1 || !(tys[0] === 'float' || tys[0] === 'int' || tys[0] === 'bool')) fail(`bad ${e.name}() constructor`, e);\n          return t(e.name);\n        }\n        if (e.name === 'void') fail('void() is not a constructor', e);\n        const n = VEC[e.name];\n        if (tys.length === 1 && (tys[0] === 'float' || tys[0] === 'int')) return t(e.name);       // splat\n        const total = tys.reduce((s, ty) => s + (ty === 'float' || ty === 'int' ? 1 : VEC[ty] || fail(`bad constructor argument ${ty}`, e)), 0);\n        if (total !== n) fail(`${e.name}() needs ${n} components but got ${total}`, e);\n        if (tys.some(ty => ty === 'int' || ty === 'bool')) fail(`${e.name}() with int/bool arguments is not supported here`, e);\n        return t(e.name);\n      }\n      case 'call': {\n        const tys = e.args.map(a => checkExpr(a, scope, fnCtx));\n        if (funcs.has(e.name)) {\n          const f = funcs.get(e.name);\n          if (f.params.length !== tys.length || f.params.some((p, i) => p.ty !== tys[i])) fail(`no matching overload for ${e.name}(${tys.join(', ')})`, e);\n          e.user = f;\n          return t(f.ret);\n        }\n        const b = bi(e.name);\n        if (!b) fail(`unknown function '${e.name}'`, e);\n        const r = b.sig(tys);\n        if (!r) fail(`no matching overload for ${e.name}(${tys.join(', ')})`, e);\n        e.builtin = b;\n        return t(r);\n      }\n      case 'post': fail('postfix increment is only supported in loop headers', e); break;\n      default: fail('unsupported expression ' + e.k, e);\n    }\n  }\n\n  class Scope {\n    constructor(parent, fn) { this.parent = parent; this.vars = new Map(); this.fn = fn || (parent && parent.fn); }\n    lookup(n) { return this.vars.get(n) || (this.parent ? this.parent.lookup(n) : null); }\n    declare(n, ty, isConst, tok) {\n      if (this.vars.has(n)) fail(`redeclaration of '${n}'`, tok);\n      const v = { ty, id: this.fn.nslots++, isConst };\n      this.vars.set(n, v); return v;\n    }\n  }\n\n  function checkStmt(s, scope, fn) {\n    switch (s.k) {\n      case 'block': { const inner = new Scope(scope); s.body.forEach(x => checkStmt(x, inner, fn)); break; }\n      case 'decl': {\n        for (const v of s.vars) {\n          if (s.ty === 'void') fail('cannot declare a void variable', v);\n          if (s.ty === 'float' || VEC[s.ty]) { if (!precisionFloat) fail('no default precision is defined for float in the fragment shader', v); }\n          if (v.init) { const it = checkExpr(v.init, scope, fn); if (it !== s.ty) fail(`cannot initialise ${s.ty} '${v.name}' with ${it}`, v); }\n          else if (s.isConst) fail('const needs an initialiser', v);\n          const slot = scope.declare(v.name, s.ty, s.isConst, v);\n          v.id = slot.id;\n        }\n        break;\n      }\n      case 'expr': checkExpr(s.e, scope, fn); break;\n      case 'if': {\n        if (checkExpr(s.c, scope, fn) !== 'bool') fail('if condition must be bool', s);\n        checkStmt(s.a, new Scope(scope), fn); if (s.b) checkStmt(s.b, new Scope(scope), fn); break;\n      }\n      case 'for': {\n        const inner = new Scope(scope);\n        // GLSL ES 1.00 Appendix A: init declares one int/float with a constant initialiser; cond compares it with a constant; inc is i++/i--/i+=c\n        if (!s.init || s.init.k !== 'decl' || s.init.vars.length !== 1 || !s.init.vars[0].init) fail('for-loop must declare one index variable with an initialiser', s);\n        if (s.init.ty !== 'int' && s.init.ty !== 'float') fail('loop index must be int or float', s);\n        checkStmt(s.init, inner, fn);\n        const idx = s.init.vars[0].name;\n        const isConstExpr = (x) => x.k === 'num' || (x.k === 'var' && (globals.get(x.name) || {}).qual === 'const');\n        if (!isConstExpr(s.init.vars[0].init)) fail('loop index initialiser must be a constant expression', s);\n        if (!s.cond || s.cond.k !== 'bin' || !['<', '>', '<=', '>=', '==', '!='].includes(s.cond.op) || s.cond.l.k !== 'var' || s.cond.l.name !== idx || !isConstExpr(s.cond.r)) fail('loop condition must compare the index with a constant expression', s);\n        checkExpr(s.cond, inner, fn);\n        if (!s.inc || !((s.inc.k === 'post' && s.inc.e.k === 'var' && s.inc.e.name === idx) || (s.inc.k === 'assign' && s.inc.l.k === 'var' && s.inc.l.name === idx && ['+=', '-='].includes(s.inc.op) && isConstExpr(s.inc.r)))) fail('loop increment must be i++, i-- or i += constant', s);\n        s.incSign = s.inc.k === 'post' ? (s.inc.op === '++' ? 1 : -1) : (s.inc.op === '+=' ? 1 : -1) * s.inc.r.v;\n        s.idxId = inner.lookup(idx).id;\n        checkStmt(s.body, new Scope(inner), fn);\n        break;\n      }\n      case 'return': {\n        const t = s.v ? checkExpr(s.v, scope, fn) : 'void';\n        if (t !== fn.ret) fail(`return type ${t} does not match function type ${fn.ret}`, s);\n        break;\n      }\n      case 'discard': case 'break': case 'continue': break;\n      default: fail('unsupported statement ' + s.k, s);\n    }\n  }\n\n  const gscope = new Scope(null, { nslots: 0 });\n  gscope.lookup = () => null;\n  for (const d of decls) {\n    if (d.k === 'precision') { if (d.ty === 'float') precisionFloat = true; continue; }\n    if (d.k === 'globals') {\n      for (const v of d.vars) {\n        if (globals.has(v.name)) fail(`redeclaration of global '${v.name}'`, v);\n        if ((d.ty === 'float' || VEC[d.ty]) && !precisionFloat && opts.stage === 'fragment') fail('no default precision is defined for float in the fragment shader', v);\n        let size = null;\n        if (v.size) {\n          const sc = new Scope(null, { nslots: 0 });\n          checkExpr(v.size, sc, {});\n          if (v.size.ty !== 'int') fail('array size must be an int constant', v);\n          size = evalConst(v.size);\n        }\n        if (d.qual === 'const') {\n          if (!v.init) fail('const needs an initialiser', v);\n          const t = checkExpr(v.init, new Scope(null, { nslots: 0 }), {});\n          if (t !== d.ty) fail(`cannot initialise const ${d.ty} '${v.name}' with ${t}`, v);\n        } else if (v.init) fail('only const globals may have initialisers', v);\n        globals.set(v.name, { ty: d.ty, qual: d.qual, size, init: v.init });\n      }\n      continue;\n    }\n    if (d.k === 'func') {\n      if (funcs.has(d.name)) fail(`redefinition of function '${d.name}'`, d);\n      funcs.set(d.name, d);\n      d.nslots = 0;\n      const sc = new Scope(null, d);\n      d.params.forEach(p => { const sl = sc.declare(p.name, p.ty, false, d); p.id = sl.id; });\n      d.scope = sc;\n      checkStmt(d.body, sc, d);\n      continue;\n    }\n  }\n  if (!funcs.has('main')) fail('no main() function');\n  return { globals, funcs };\n\n  function evalConst(x) {\n    if (x.k === 'num') return x.v;\n    fail('array size must be a literal constant here', x);\n  }\n}\n\n/* ---------------- evaluation ---------------- */\nfunction build(info, uniforms) {\n  const G = { gl_FragColor: [0, 0, 0, 0], gl_FragCoord: [0, 0, 0, 1] };\n  for (const [name, g] of info.globals) {\n    if (g.qual === 'const') G[name] = null;                       // filled below\n  }\n  const compileExpr = (e) => {\n    switch (e.k) {\n      case 'num': { const v = e.v; return () => v; }\n      case 'bool': { const v = e.v; return () => v; }\n      case 'var': {\n        if (e.ref.local) { const id = e.ref.id; return (f) => f[id]; }\n        const n = e.ref.global; return () => G[n];\n      }\n      case 'unary': {\n        const a = compileExpr(e.e);\n        if (e.op === '!') return (f) => !a(f);\n        if (e.op === '-') return (f) => { const v = a(f); return typeof v === 'number' ? -v : v.map(x => -x); };\n        return a;\n      }\n      case 'bin': {\n        const a = compileExpr(e.l), b = compileExpr(e.r), op = e.op, ta = e.l.ty, tb = e.r.ty;\n        if (op === '&&') return (f) => a(f) && b(f);\n        if (op === '||') return (f) => a(f) || b(f);\n        if (op === '^^') return (f) => a(f) !== b(f);\n        const cmp = { '<': (x, y) => x < y, '>': (x, y) => x > y, '<=': (x, y) => x <= y, '>=': (x, y) => x >= y,\n          '==': (x, y) => (typeof x === 'object' ? x.every((v, i) => v === y[i]) : x === y), '!=': (x, y) => (typeof x === 'object' ? !x.every((v, i) => v === y[i]) : x !== y) };\n        if (cmp[op]) return (f) => cmp[op](a(f), b(f));\n        const sc = { '+': (x, y) => x + y, '-': (x, y) => x - y, '*': (x, y) => x * y, '/': ta === 'int' ? (x, y) => Math.trunc(x / y) : (x, y) => x / y }[op];\n        return (f) => {\n          const x = a(f), y = b(f);\n          if (typeof x === 'number') return typeof y === 'number' ? sc(x, y) : y.map(v => sc(x, v));\n          return typeof y === 'number' ? x.map(v => sc(v, y)) : x.map((v, i) => sc(v, y[i]));\n        };\n      }\n      case 'cond': { const c = compileExpr(e.c), a = compileExpr(e.a), b = compileExpr(e.b); return (f) => (c(f) ? a(f) : b(f)); }\n      case 'field': {\n        const a = compileExpr(e.e), idx = e.idx;\n        if (idx.length === 1) { const i = idx[0]; return (f) => a(f)[i]; }\n        return (f) => { const v = a(f); return idx.map(i => v[i]); };\n      }\n      case 'index': { const n = e.e.ref.global, i = compileExpr(e.i); return (f) => { const k = i(f); const arr = G[n]; if (k < 0 || k >= arr.length) throw new GLSLError(`index ${k} out of range for ${n}`); return arr[k]; }; }\n      case 'ctor': {\n        const args = e.args.map(compileExpr), name = e.name;\n        if (name === 'float') return (f) => { const v = args[0](f); return typeof v === 'boolean' ? (v ? 1 : 0) : v; };\n        if (name === 'int') return (f) => Math.trunc(args[0](f));\n        if (name === 'bool') return (f) => !!args[0](f);\n        const n = VEC[name];\n        return (f) => {\n          const out = [];\n          for (const a of args) { const v = a(f); if (typeof v === 'number') out.push(v); else out.push(...v); }\n          if (out.length === 1) { const v = out[0]; return new Array(n).fill(v); }\n          return out;\n        };\n      }\n      case 'call': {\n        const args = e.args.map(compileExpr);\n        if (e.builtin) { const fn = e.builtin.f; return (f) => fn(...args.map(a => a(f))); }\n        const user = e.user; const run = () => user.compiled;\n        return (f) => {\n          const frame = new Array(user.nslots);\n          for (let i = 0; i < user.params.length; i++) { const v = args[i](f); frame[user.params[i].id] = typeof v === 'object' ? v.slice() : v; }\n          return run()(frame);\n        };\n      }\n      case 'assign': {\n        const r = compileExpr(e.r), op = e.op;\n        const target = e.l.ref.local ? { local: e.l.ref.id } : { global: e.l.ref.global };\n        const ty = e.l.ty;\n        const sc = { '+=': (x, y) => x + y, '-=': (x, y) => x - y, '*=': (x, y) => x * y, '/=': ty === 'int' ? (x, y) => Math.trunc(x / y) : (x, y) => x / y }[op];\n        const get = target.local !== undefined ? (f) => f[target.local] : () => G[target.global];\n        const set = target.local !== undefined ? (f, v) => { f[target.local] = v; } : (f, v) => { G[target.global] = v; };\n        return (f) => {\n          let v = r(f);\n          if (op !== '=') {\n            const x = get(f);\n            v = typeof x === 'number' ? sc(x, v) : (typeof v === 'number' ? x.map(q => sc(q, v)) : x.map((q, i) => sc(q, v[i])));\n          } else if (typeof v === 'object') v = v.slice();\n          set(f, v); return v;\n        };\n      }\n      default: throw new GLSLError('cannot compile ' + e.k);\n    }\n  };\n\n  const compileStmt = (s) => {\n    switch (s.k) {\n      case 'block': { const b = s.body.map(compileStmt); return (f) => { for (const x of b) { const r = x(f); if (r) return r; } }; }\n      case 'decl': { const vs = s.vars.map(v => ({ id: v.id, init: v.init ? compileExpr(v.init) : null, ty: s.ty })); return (f) => { for (const v of vs) { f[v.id] = v.init ? (typeof (f[v.id] = v.init(f)) === 'object' ? f[v.id].slice() : f[v.id]) : (VEC[v.ty] ? new Array(VEC[v.ty]).fill(0) : 0); } }; }\n      case 'expr': { const e = compileExpr(s.e); return (f) => { e(f); }; }\n      case 'if': { const c = compileExpr(s.c), a = compileStmt(s.a), b = s.b ? compileStmt(s.b) : null; return (f) => (c(f) ? a(f) : b ? b(f) : undefined); }\n      case 'for': {\n        const init = compileStmt(s.init), cond = compileExpr(s.cond), body = compileStmt(s.body), id = s.idxId, step = s.incSign;\n        return (f) => {\n          init(f);\n          for (let guard = 0; cond(f); guard++) {\n            if (guard > 4096) throw new GLSLError('loop did not terminate');\n            const r = body(f);\n            if (r === 'break') break;\n            if (r && r !== 'continue') return r;\n            f[id] += step;\n          }\n        };\n      }\n      case 'return': { const v = s.v ? compileExpr(s.v) : null; return (f) => { f.ret = v ? v(f) : undefined; return 'return'; }; }\n      case 'discard': return () => 'discard';\n      case 'break': return () => 'break';\n      case 'continue': return () => 'continue';\n      default: throw new GLSLError('cannot compile ' + s.k);\n    }\n  };\n\n  for (const [, fn] of info.funcs) fn.compiled = null;\n  for (const [, fn] of info.funcs) {\n    const body = compileStmt(fn.body);\n    fn.compiled = (frame) => { const r = body(frame); if (r === 'discard') frame.discarded = true; return frame.ret; };\n  }\n  // constants first (they may be used by functions at call time)\n  for (const [name, g] of info.globals) {\n    if (g.qual === 'const') { const e = compileExpr(g.init); G[name] = e([]); }\n  }\n  for (const [name, v] of Object.entries(uniforms || {})) G[name] = v;\n  return { G, main: info.funcs.get('main') };\n}\n\nfunction compileGLSL(src, { stage = 'fragment', defines = {} } = {}) {\n  const pre = preprocess(src, defines);\n  const toks = lex(pre.text, pre.defs);\n  const decls = new Parser(toks).program();\n  const info = typeCheck(decls, { stage });\n  return {\n    info,\n    // returns a runner: setUniform(name, value) and run() -> gl_FragColor (or null if discarded)\n    instance(uniforms) {\n      const { G, main } = build(info, uniforms);\n      return {\n        G,\n        run(varyings) {\n          Object.assign(G, varyings);\n          G.gl_FragColor = [0, 0, 0, 0];\n          const frame = new Array(main.nslots);\n          main.compiled(frame);\n          return frame.discarded ? null : G.gl_FragColor;\n        }\n      };\n    }\n  };\n}\n\nmodule.exports = { compileGLSL, GLSLError };\n"
}

[tool result]
File created successfully at: [workspace]/.t/glsl.js (file state is current in your context — no need to Read it back)

[system]
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[assistant]
First a self-test of the interpreter itself: it must accept valid shaders, compute correct values, and reject the typical mistakes a real compiler rejects.

[tool Write]
{
  "file_path": "[workspace]/.t/glsl_selftest.js",
  "content": "'use strict';\nconst { compileGLSL, GLSLError } = require('./glsl.js');\nlet bad = 0;\nfunction ok(name, cond, extra) { if (!cond) { bad++; console.log('FAIL', name, extra || ''); } else console.log('ok  ', name); }\n\nconst HDR = '#ifdef GL_FRAGMENT_PRECISION_HIGH\\nprecision highp float;\\n#else\\nprecision mediump float;\\n#endif\\n';\nconst D = { GL_FRAGMENT_PRECISION_HIGH: '1' };\nfunction run(body, uniforms, varyings) {\n  const c = compileGLSL(HDR + body, { defines: D });\n  return c.instance(uniforms || {}).run(varyings || {});\n}\nfunction rejects(name, body, re) {\n  try { compileGLSL(HDR + body, { defines: D }); ok(name, false, 'was accepted'); }\n  catch (e) { ok(name, e instanceof GLSLError && (!re || re.test(e.message)), e.message); }\n}\n\n// valid programs\nlet r = run('void main(){ float a = 2.0; vec3 v = vec3(a, 1.0, 0.5) * a; gl_FragColor = vec4(v, 1.0); }');\nok('constructor + scalar multiply', r && r[0] === 4 && r[1] === 2 && r[2] === 1 && r[3] === 1, JSON.stringify(r));\nr = run('#define NB 3\\nuniform float u[NB];\\nvoid main(){ float s = 0.0; for (int i = 0; i < NB; i++) { s += u[i]; } gl_FragColor = vec4(s); }', { u: [1, 2, 4] });\nok('macro, uniform array, for loop', r && r[0] === 7, JSON.stringify(r));\nr = run('void main(){ vec3 a = vec3(1.0,0.0,0.0); vec3 b = vec3(0.0,1.0,0.0); float t = 0.25; vec3 c = t < 0.5 ? mix(a, b, t * 2.0) : mix(b, a, t); gl_FragColor = vec4(c, smoothstep(0.0, 1.0, 0.5)); }');\nok('ternary with vec3 + mix + smoothstep', r && Math.abs(r[0] - 0.5) < 1e-9 && Math.abs(r[3] - 0.5) < 1e-9, JSON.stringify(r));\nr = run('float f(float x){ return x * 3.0; }\\nvoid main(){ vec2 p = vec2(1.0, 2.0); p *= 2.0; gl_FragColor = vec4(f(p.y), p.xy, length(vec2(3.0,4.0))); }');\nok('function call, compound assign, swizzle, length', r && r[0] === 12 && r[1] === 2 && r[2] === 4 && r[3] === 5, JSON.stringify(r));\nr = run('varying vec2 vUv;\\nvoid main(){ if (vUv.x > 0.5) { gl_FragColor = vec4(1.0); return; } gl_FragColor = vec4(0.0); }', {}, { vUv: [0.9, 0] });\nok('varying + early return', r && r[0] === 1, JSON.stringify(r));\n\n// things a real compiler rejects\nrejects('int literal assigned to float', 'void main(){ float x = 1; gl_FragColor = vec4(x); }', /initialise/);\nrejects('int * float', 'void main(){ int i = 2; float x = i * 2.0; gl_FragColor = vec4(x); }', /implicit conversion|operands/);\nrejects('vec2 + vec3', 'void main(){ vec2 a = vec2(1.0); vec3 b = vec3(1.0); gl_FragColor = vec4(a + b, 1.0); }', /implicit conversion/);\nrejects('undeclared identifier', 'void main(){ gl_FragColor = vec4(nope); }', /undeclared/);\nrejects('wrong constructor size', 'void main(){ gl_FragColor = vec4(vec2(1.0), 1.0); }', /components/);\nrejects('ternary type mismatch', 'void main(){ gl_FragColor = vec4(true ? 1.0 : vec2(1.0).x, 0.0, 0.0, 1.0) + (true ? vec4(1.0) : 1.0); }', /same type/);\nrejects('non-constant loop bound', 'uniform float n;\\nvoid main(){ float s = 0.0; for (int i = 0; i < n; i++) { s += 1.0; } gl_FragColor = vec4(s); }', /loop condition|compare/);\nrejects('float loop bound mismatch', 'void main(){ float s = 0.0; for (int i = 0; i < 4.0; i++) { s += 1.0; } gl_FragColor = vec4(s); }', /loop condition|matching/);\nrejects('assign to uniform', 'uniform float u;\\nvoid main(){ u = 1.0; gl_FragColor = vec4(u); }', /cannot assign/);\nrejects('bad swizzle', 'void main(){ vec2 a = vec2(1.0); gl_FragColor = vec4(a.z); }', /swizzle/);\nrejects('missing default precision', 'void main(){ float a = 1.0; gl_FragColor = vec4(a); }'.replace(/^/, ''), null);\nrejects('wrong builtin arg types', 'void main(){ gl_FragColor = vec4(pow(1.0, vec2(1.0).x), mix(1.0, 2.0, vec2(1.0)), 0.0, 0.0); }', /overload/);\ntry {\n  compileGLSL('void main(){ float a = 1.0; gl_FragColor = vec4(a); }', { defines: D });\n  ok('missing default precision (no header)', false, 'was accepted');\n} catch (e) { ok('missing default precision (no header)', /precision/.test(e.message), e.message); }\nconsole.log(bad ? `${bad} FAILED` : 'all interpreter self-tests passed');\nprocess.exitCode = bad ? 1 : 0;\n"
}

[tool result]
File created successfully at: [workspace]/.t/glsl_selftest.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/glsl_selftest.js 2>&1 | head -40",
  "description": "Run GLSL interpreter self-tests",
  "timeout": 60000
}

[tool error]
Exit code 1
ok   constructor + scalar multiply
ok   macro, uniform array, for loop
ok   ternary with vec3 + mix + smoothstep
ok   function call, compound assign, swizzle, length
ok   varying + early return
ok   int literal assigned to float
ok   int * float
ok   vec2 + vec3
ok   undeclared identifier
ok   wrong constructor size
ok   ternary type mismatch
ok   non-constant loop bound
ok   float loop bound mismatch
ok   assign to uniform
ok   bad swizzle
FAIL missing default precision was accepted
ok   wrong builtin arg types
ok   missing default precision (no header)
1 FAILED
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
That FAIL was a flaw in my test, not the interpreter, so I'll remove it and run the interpreter directly on the actual page shader, compiling both the highp and mediump `FS` variants and comparing per-pixel output against the JS reference.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/.t/glsl_selftest.js",
  "old_string": "rejects('missing default precision', 'void main(){ float a = 1.0; gl_FragColor = vec4(a); }'.replace(/^/, ''), null);\n",
  "new_string": ""
}

[tool result]
The file [workspace]/.t/glsl_selftest.js has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "win.__lava = { sim, setPower, shade, fieldAt, get wax() { return wax; }, get layout() { return L; }, ub, us };",
  "new_string": "win.__lava = { sim, setPower, shade, fieldAt, VS, FS, get wax() { return wax; }, get layout() { return L; }, ub, us };"
}

[tool result]
The file [workspace]/index.html has been updated successfully.

[tool Write]
{
  "file_path": "[workspace]/.t/glsl_check.js",
  "content": "'use strict';\n// Validate the page's real GLSL: type-check it, execute it per pixel, and compare with the JS reference shader.\nconst { createPage, OUT } = require('./harness.js');\nconst { compileGLSL } = require('./glsl.js');\nconst { writePNG } = require('./mock2d.js');\nconst path = require('path');\n\nconst page = createPage({ vw: 390, vh: 844, dpr: 1 });\nconst A = page.win.__lava;\nconst sim = A.sim, N = sim.x.length;\n\n// 1. compile both precision variants of the fragment shader, and the vertex shader\nfor (const [label, defs] of [['highp', { GL_FRAGMENT_PRECISION_HIGH: '1' }], ['mediump', {}]]) {\n  compileGLSL(A.FS, { stage: 'fragment', defines: defs });\n  console.log(`fragment shader (${label}) type-checks`);\n}\ncompileGLSL(A.VS, { stage: 'vertex' });\nconsole.log('vertex shader type-checks');\n\n// 2. execute and compare\nconst fs = compileGLSL(A.FS, { stage: 'fragment', defines: { GL_FRAGMENT_PRECISION_HIGH: '1' } });\nconst WX0 = -24, WX1 = 24, WY0 = -3, WY1 = 73.6, WW = WX1 - WX0, WH = WY1 - WY0;\nconst W = +process.argv[2] || 96, H = Math.round(W * WH / WW);\nconst secsList = (process.argv[3] || '0,13').split(',').map(Number);\nconst lights = (process.argv[4] || '1,0.4,0').split(',').map(Number);\n\nfunction stepTo(t) { while (sim.time < 70 + t) sim.step(1 / 60); }\nfunction pack() {\n  for (let i = 0; i < N; i++) {\n    A.ub[i * 4] = sim.x[i]; A.ub[i * 4 + 1] = sim.y[i]; A.ub[i * 4 + 2] = sim.r[i]; A.ub[i * 4 + 3] = sim.T[i]; A.us[i] = sim.st[i];\n  }\n}\nlet worstAll = 0;\nfor (const t of secsList) {\n  stepTo(t); pack();\n  for (const light of lights) {\n    const uB = [], uS = [];\n    for (let i = 0; i < N; i++) { uB.push([A.ub[i * 4], A.ub[i * 4 + 1], A.ub[i * 4 + 2], A.ub[i * 4 + 3]]); uS.push(A.us[i]); }\n    const px = WW / W;\n    const inst = fs.instance({ uB, uS, uV: [WX0, WY0, WW, WH], uA: [px, light] });\n    const img = new Uint8Array(W * H * 4), diffImg = new Uint8Array(W * H * 4);\n    let sum = 0, worst = 0, worstAt = null, nan = 0, wax = 0;\n    const ref = [0, 0, 0, 0], fo = [0, 0, 0, 0];\n    const t0 = Date.now();\n    for (let j = 0; j < H; j++) for (let i = 0; i < W; i++) {\n      const u = (i + 0.5) / W, v = 1 - (j + 0.5) / H;          // GL: v = 0 at the bottom\n      const out = inst.run({ vUv: [u, v] });\n      const x = WX0 + u * WW, y = WY0 + v * WH;\n      A.fieldAt(A.ub, A.us, x, y, fo);\n      A.shade(fo[0], fo[1], fo[2], fo[3], x, y, px, light, ref);\n      let d = 0;\n      for (let k = 0; k < 4; k++) { if (!isFinite(out[k])) nan++; d = Math.max(d, Math.abs(out[k] - ref[k])); }\n      sum += d; if (d > worst) { worst = d; worstAt = [x.toFixed(1), y.toFixed(1)]; }\n      if (fo[0] > 0.55) wax++;\n      const p = (j * W + i) * 4;\n      // premultiplied over a dark wall colour\n      const bg = [40, 36, 70];\n      for (let k = 0; k < 3; k++) img[p + k] = Math.round(Math.min(1, out[k]) * 255 + bg[k] * (1 - out[3]));\n      img[p + 3] = 255;\n      diffImg[p] = diffImg[p + 1] = diffImg[p + 2] = Math.min(255, Math.round(d * 255 * 8)); diffImg[p + 3] = 255;\n    }\n    worstAll = Math.max(worstAll, worst);\n    console.log(`t=${t}s light=${light}: ${W}x${H} px in ${Date.now() - t0} ms | mean |diff| ${(sum / (W * H)).toFixed(5)} | max |diff| ${worst.toFixed(4)} at ${worstAt} | NaN ${nan} | wax px ${wax}`);\n    writePNG(path.join(OUT, `glsl_t${t}_l${light}.png`), W, H, img);\n    if (light === lights[0]) writePNG(path.join(OUT, `glsl_t${t}_diff.png`), W, H, diffImg);\n  }\n}\nconsole.log(worstAll < 0.05 ? 'GLSL output matches the JS reference' : 'GLSL output DIFFERS from the JS reference');\n"
}

[tool result]
File created successfully at: [workspace]/.t/glsl_check.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/glsl_selftest.js 2>&1 | tail -3; node .t/glsl_check.js 80 0,13 1,0.4,0 2>&1 | head -30",
  "description": "Validate and execute the real fragment shader in Node",
  "timeout": 600000
}

[tool error]
Exit code 1
ok   wrong builtin arg types
ok   missing default precision (no header)
all interpreter self-tests passed
fragment shader (highp) type-checks
fragment shader (mediump) type-checks
[workspace]/.t/glsl.js:11
const fail = (msg, tok) => { throw new GLSLError(msg + (tok && tok.line ? ` (line ${tok.line})` : '')); };
                             ^

GLSLError: cannot assign to varying 'vUv' (line 1)
    at fail ([workspace]/.t/glsl.js:11:36)
    at checkExpr ([workspace]/.t/glsl.js:329:184)
    at checkStmt ([workspace]/.t/glsl.js:410:20)
    at [workspace]/.t/glsl.js:398:75
    at Array.forEach ()
    at checkStmt ([workspace]/.t/glsl.js:398:62)
    at typeCheck ([workspace]/.t/glsl.js:473:7)
    at compileGLSL ([workspace]/.t/glsl.js:615:16)
    at Object. ([workspace]/.t/glsl_check.js:17:1)
    at Module._compile (node:internal/modules/cjs/loader:1781:14)

Node.js v22.23.4
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
The fragment shader checks out fine, but the vertex shader failure is actually a bug in my checker—it's not accounting for stage-specific rules like varying assignments and default precision. I'll update the checker to be stage-aware.

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet s=fs.readFileSync('.t/glsl.js','utf8');\n// stage-aware varying assignment and builtin gl_Position\ns=s.replace(\\\"if (e.name === 'gl_FragCoord') { e.ref = { global: 'gl_FragCoord' }; return t('vec4'); }\\\", \\\"if (e.name === 'gl_FragCoord' && opts.stage === 'fragment') { e.ref = { global: 'gl_FragCoord' }; return t('vec4'); }\\\\n        if (e.name === 'gl_Position' && opts.stage === 'vertex') { e.ref = { global: 'gl_Position' }; return t('vec4'); }\\\");\ns=s.replace(\\\"if (e.name === 'gl_FragColor') {\\\", \\\"if (e.name === 'gl_FragColor' && opts.stage === 'fragment') {\\\");\ns=s.replace(\\\"['uniform', 'varying', 'const'].includes(globals.get(e.l.ref.global).qual)) fail\\\", \\\"(['uniform', 'const', 'attribute'].includes(globals.get(e.l.ref.global).qual) || (globals.get(e.l.ref.global).qual === 'varying' && opts.stage === 'fragment'))) fail\\\");\ns=s.replace(\\\"if (s.ty === 'float' || VEC[s.ty]) { if (!precisionFloat) fail(\\\", \\\"if (s.ty === 'float' || VEC[s.ty]) { if (!precisionFloat && opts.stage === 'fragment') fail(\\\");\ns=s.replace(\\\"const G = { gl_FragColor: [0, 0, 0, 0], gl_FragCoord: [0, 0, 0, 1] };\\\", \\\"const G = { gl_FragColor: [0, 0, 0, 0], gl_FragCoord: [0, 0, 0, 1], gl_Position: [0, 0, 0, 1] };\\\");\nfs.writeFileSync('.t/glsl.js',s);\n\" 2>&1 | head -3; grep -n \"gl_Position\" .t/glsl.js | head; node .t/glsl_selftest.js 2>&1 | tail -2",
  "description": "Make the GLSL checker stage-aware"
}

[tool error]
Exit code 1
301:        if (e.name === 'gl_Position' && opts.stage === 'vertex') { e.ref = { global: 'gl_Position' }; return t('vec4'); }
489:  const G = { gl_FragColor: [0, 0, 0, 0], gl_FragCoord: [0, 0, 0, 1], gl_Position: [0, 0, 0, 1] };
ok   missing default precision (no header)
all interpreter self-tests passed
zsh:11: operation not permitted: [redacted:local-path]

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[assistant]
That change was my own patch to the checker, so I'll continue by running the shader comparison.

[tool Bash]
{
  "command": "node .t/glsl_check.js 80 0,13 1,0.4,0 2>&1 | head -30",
  "description": "Execute real shader and compare with JS reference",
  "timeout": 600000
}

[tool error]
Exit code 1
fragment shader (highp) type-checks
fragment shader (mediump) type-checks
vertex shader type-checks
t=0s light=1: 80x128 px in 73 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.1,72.7 | NaN 0 | wax px 1069
t=0s light=0.4: 80x128 px in 67 ms | mean |diff| 0.00000 | max |diff| 0.0001 at 8.1,72.7 | NaN 0 | wax px 1069
t=0s light=0: 80x128 px in 64 ms | mean |diff| 0.00000 | max |diff| 0.0001 at -8.1,72.7 | NaN 0 | wax px 1069
t=13s light=1: 80x128 px in 65 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.1,72.7 | NaN 0 | wax px 1196
t=13s light=0.4: 80x128 px in 61 ms | mean |diff| 0.00000 | max |diff| 0.0001 at 8.1,72.7 | NaN 0 | wax px 1196
t=13s light=0: 80x128 px in 60 ms | mean |diff| 0.00000 | max |diff| 0.0001 at -8.1,72.7 | NaN 0 | wax px 1196
GLSL output matches the JS reference
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
The shader passes type-checking and matches the JS reference within 0.0002 per pixel across all tested states and light levels, with no NaNs. Now I'll render a larger image of the GLSL output to inspect it visually.

[tool Bash]
{
  "command": "node .t/glsl_check.js 260 13 1 2>&1 | tail -3",
  "description": "Render larger image of GLSL shader output",
  "timeout": 600000
}

[tool error]
Exit code 1
vertex shader type-checks
t=13s light=1: 260x415 px in 619 ms | mean |diff| 0.00000 | max |diff| 0.0005 at -8.0,73.1 | NaN 0 | wax px 12613
GLSL output matches the JS reference
zsh:1: operation not permitted: [redacted:local-path]

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[tool Read]
{
  "file_path": "[workspace]/.t/out/glsl_t13_l1.png"
}

[tool result]
[image]

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[thinking]
The shader source checks out with crisp edges and glossy highlights, but the JavaScript WebGL glue (uniforms, array uploads, viewport, readPixels, startup checks) is still unverified. I'll create a mock WebGL context backed by my interpreter so the page's actual `makeGL` code can run end-to-end in Node.

[tool Write]
{
  "file_path": "[workspace]/.t/fakegl.js",
  "content": "'use strict';\n// A fake WebGL1 context that \"runs\" the page's GLSL with the Node interpreter, so the page's real GL code path\n// (shader build, uniform upload, draw, readPixels self-check) can be exercised without a GPU.\nconst { compileGLSL } = require('./glsl.js');\n\nconst C = {\n  VERTEX_SHADER: 35633, FRAGMENT_SHADER: 35632, COMPILE_STATUS: 35713, LINK_STATUS: 35714, ARRAY_BUFFER: 34962, STATIC_DRAW: 35044,\n  FLOAT: 5126, TRIANGLE_STRIP: 5, BLEND: 3042, DEPTH_TEST: 2929, DITHER: 3024, MAX_FRAGMENT_UNIFORM_VECTORS: 36349, RGBA: 6408, UNSIGNED_BYTE: 5121\n};\n\nclass FakeGL {\n  constructor(canvas, opts) {\n    Object.assign(this, C);\n    this.canvas = canvas; this.opts = opts || {};\n    this.vp = [0, 0, canvas.width, canvas.height];\n    this.calls = { draw: 0, uniform: 0 };\n    this.log = [];\n  }\n  getParameter(p) { return p === C.MAX_FRAGMENT_UNIFORM_VECTORS ? 64 : 0; }\n  createShader(type) { return { type, src: '', ok: false, c: null, err: '' }; }\n  shaderSource(s, src) { s.src = src; }\n  compileShader(s) {\n    try {\n      s.c = compileGLSL(s.src, { stage: s.type === C.VERTEX_SHADER ? 'vertex' : 'fragment', defines: { GL_FRAGMENT_PRECISION_HIGH: '1' } });\n      s.ok = true;\n    } catch (e) { s.ok = false; s.err = e.message; this.log.push('compile error: ' + e.message); }\n  }\n  getShaderParameter(s, p) { return p === C.COMPILE_STATUS ? s.ok : null; }\n  createProgram() { return { shaders: [], ok: false, inst: null }; }\n  attachShader(p, s) { p.shaders.push(s); }\n  linkProgram(p) {\n    const vs = p.shaders.find(s => s.type === C.VERTEX_SHADER), fs = p.shaders.find(s => s.type === C.FRAGMENT_SHADER);\n    p.ok = !!(vs && fs && vs.ok && fs.ok);\n    if (p.ok) { p.fs = fs.c; p.inst = fs.c.instance({}); }\n  }\n  getProgramParameter(p, q) { return q === C.LINK_STATUS ? p.ok : null; }\n  useProgram(p) { this.prog = p; }\n  createBuffer() { return {}; }\n  bindBuffer() {}\n  bufferData() {}\n  getAttribLocation() { return 0; }\n  enableVertexAttribArray() {}\n  vertexAttribPointer() {}\n  disable() {}\n  getUniformLocation(p, name) { const g = p.fs.info.globals.get(name); return g && g.qual === 'uniform' ? { name, g } : null; }\n  _set(loc, v) { this.prog.inst.G[loc.name] = v; this.calls.uniform++; }\n  uniform4f(loc, a, b, c, d) { this._set(loc, [a, b, c, d]); }\n  uniform2f(loc, a, b) { this._set(loc, [a, b]); }\n  uniform1f(loc, a) { this._set(loc, a); }\n  uniform4fv(loc, arr) {\n    if (loc.g.size != null) {\n      if (arr.length !== loc.g.size * 4) throw new Error(`uniform4fv: expected ${loc.g.size * 4} floats for ${loc.name}, got ${arr.length}`);\n      const out = []; for (let i = 0; i < loc.g.size; i++) out.push([arr[i * 4], arr[i * 4 + 1], arr[i * 4 + 2], arr[i * 4 + 3]]);\n      this._set(loc, out);\n    } else this._set(loc, [arr[0], arr[1], arr[2], arr[3]]);\n  }\n  uniform1fv(loc, arr) {\n    if (loc.g.size == null) throw new Error('uniform1fv on a non-array');\n    if (arr.length !== loc.g.size) throw new Error(`uniform1fv: expected ${loc.g.size} floats for ${loc.name}, got ${arr.length}`);\n    this._set(loc, Array.from(arr));\n  }\n  viewport(x, y, w, h) { this.vp = [x, y, w, h]; }\n  drawArrays() {\n    const w = this.canvas.width, h = this.canvas.height;\n    if (!this.fb || this.fb.length !== w * h * 4) this.fb = new Uint8Array(w * h * 4);\n    const inst = this.prog.inst, fb = this.fb, buf = this.canvas._buf;\n    this.calls.draw++;\n    for (let j = 0; j < h; j++) for (let i = 0; i < w; i++) {\n      const out = inst.run({ vUv: [(i + 0.5) / w, (j + 0.5) / h] }) || [0, 0, 0, 0];\n      const p = (j * w + i) * 4;\n      for (let k = 0; k < 4; k++) fb[p + k] = Math.max(0, Math.min(255, Math.round(out[k] * 255)));\n      if (this.opts.corrupt) { const t = fb[p]; fb[p] = fb[p + 2]; fb[p + 2] = t; }   // simulate a driver/shader bug: swapped channels\n      const q = ((h - 1 - j) * w + i) * 4;          // canvas rows run top to bottom\n      for (let k = 0; k < 4; k++) buf[q + k] = fb[p + k] / 255;\n    }\n  }\n  readPixels(x, y, w, h, format, type, out) {\n    const cw = this.canvas.width;\n    for (let j = 0; j < h; j++) for (let i = 0; i < w; i++) for (let k = 0; k < 4; k++) out[(j * w + i) * 4 + k] = this.fb[((y + j) * cw + x + i) * 4 + k];\n  }\n}\n\nmodule.exports = { FakeGL };\n"
}

[tool result]
File created successfully at: [workspace]/.t/fakegl.js (file state is current in your context — no need to Read it back)

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/.t/harness.js",
  "old_string": "    if (type === 'webgl' || type === 'experimental-webgl') {\n      if (page.glMode === 'none') return null;\n      if (page.glMode === 'badshader') { c._hadGL = true; return fakeBadGL(); }\n      return null;\n    }",
  "new_string": "    if (type === 'webgl' || type === 'experimental-webgl') {\n      if (page.glMode === 'none') return null;\n      if (page.glMode === 'badshader') { c._hadGL = true; return fakeBadGL(); }\n      if (page.glMode === 'interp' || page.glMode === 'interp-corrupt') {\n        if (!c._gl) c._gl = new FakeGL(c, { corrupt: page.glMode === 'interp-corrupt' });\n        c._hadGL = true; page.gls.push(c._gl);\n        return c._gl;\n      }\n      return null;\n    }"
}

[tool result]
The file [workspace]/.t/harness.js has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet s=fs.readFileSync('.t/harness.js','utf8');\ns=s.replace(\\\"const { MockCanvas, writePNG, composite } = require('./mock2d.js');\\\", \\\"const { MockCanvas, writePNG, composite } = require('./mock2d.js');\\\\nconst { FakeGL } = require('./fakegl.js');\\\");\ns=s.replace(\\\"const page = { glMode: o.glMode, now: 0, raf: null, o };\\\", \\\"const page = { glMode: o.glMode, now: 0, raf: null, o, gls: [] };\\\");\nfs.writeFileSync('.t/harness.js',s);\n\" 2>&1 | head -3; grep -n \"FakeGL\\|gls\" .t/harness.js | head",
  "description": "Wire fake GL into the harness"
}

[tool error]
Exit code 1
7:const { FakeGL } = require('./fakegl.js');
33:        if (!c._gl) c._gl = new FakeGL(c, { corrupt: page.glMode === 'interp-corrupt' });
34:        c._hadGL = true; page.gls.push(c._gl);
54:  const page = { glMode: o.glMode, now: 0, raf: null, o, gls: [] };
zsh:7: operation not permitted: [redacted:local-path]

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[thinking]
I'll test all rendering paths end to end: GPU via the interpreter, GPU with a corrupted result to verify the self-check catches it and falls back, a shader that fails to compile, and the no-WebGL case.

[tool Write]
{
  "file_path": "[workspace]/.t/t_gl.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nlet bad = 0;\nconst ok = (name, cond, extra) => { if (!cond) { bad++; console.log('FAIL', name, extra || ''); } else console.log('ok  ', name, extra || ''); };\n\nfunction waxPixels(page) {            // count non-transparent pixels in the wax canvas currently in the DOM\n  const c = page.els.room.children[2];\n  let n = 0; for (let i = 3; i < c._buf.length; i += 4) if (c._buf[i] > 0.5) n++;\n  return { n, canvas: c };\n}\n\nfor (const [mode, expectKind, expectReplaced, search] of [\n  ['interp', 'gl', false, ''],\n  ['interp-corrupt', 'cpu', true, ''],\n  ['badshader', 'cpu', true, ''],\n  ['none', 'cpu', false, ''],\n  ['interp', 'cpu', false, '?cpu']\n]) {\n  const label = `${mode}${search}`;\n  const page = createPage({ vw: 390, vh: 844, dpr: 1, glMode: mode, search });\n  const A = page.win.__lava;\n  const original = page.els.wax;\n  page.frames(4);\n  const w = A.wax;\n  ok(`${label}: renderer is ${expectKind}`, w && w.kind === expectKind, w && w.kind);\n  const { n, canvas } = waxPixels(page);\n  ok(`${label}: wax canvas has content`, n > 2000, n + ' px');\n  ok(`${label}: canvas ${expectReplaced ? 'replaced' : 'kept'}`, (canvas !== original) === expectReplaced);\n  ok(`${label}: canvas sized and placed`, canvas.width > 50 && canvas.height > 50 && parseFloat(canvas.style.width) > 100, `${canvas.width}x${canvas.height} css ${canvas.style.width}`);\n  if (mode === 'interp' && !search) {\n    ok('gl: uniforms were uploaded every frame', page.gls[0].calls.uniform > 8 && page.gls[0].calls.draw >= 5, JSON.stringify(page.gls[0].calls));\n    page.click(); page.frames(120);                          // switch off: light fades, still renders without error\n    page.shot('gl_off.png', 1);\n    page.click(); page.frames(60);\n    page.shot('gl_on.png', 1);\n    ok('gl: survives off/on', A.wax.kind === 'gl');\n  }\n}\nconsole.log(bad ? `${bad} FAILED` : 'all render-path tests passed');\nprocess.exitCode = bad ? 1 : 0;\n"
}

[tool result]
File created successfully at: [workspace]/.t/t_gl.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/t_gl.js 2>&1 | head -40",
  "description": "Test GPU, corrupted-GPU, bad-shader and no-WebGL render paths",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01C1CBHmoTzhPR11i2fKN2F3-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01C1CBHmoTzhPR11i2fKN2F3","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"06e5d2b7-c55f-462c-8963-17518ad9c0fb"}

[system]
task_notification

[tool error]
Exit code 1
ok   interp: renderer is gl gl
ok   interp: wax canvas has content 34719 px
ok   interp: canvas kept 
ok   interp: canvas sized and placed 187x299 css 187.2px
ok   gl: uniforms were uploaded every frame {"draw":6,"uniform":19}
ok   gl: survives off/on 
ok   interp-corrupt: renderer is cpu cpu
ok   interp-corrupt: wax canvas has content 34685 px
ok   interp-corrupt: canvas replaced 
ok   interp-corrupt: canvas sized and placed 187x299 css 187.2px
ok   badshader: renderer is cpu cpu
ok   badshader: wax canvas has content 34685 px
ok   badshader: canvas replaced 
ok   badshader: canvas sized and placed 187x299 css 187.2px
ok   none: renderer is cpu cpu
ok   none: wax canvas has content 34685 px
ok   none: canvas kept 
ok   none: canvas sized and placed 187x299 css 187.2px
ok   interp?cpu: renderer is cpu cpu
ok   interp?cpu: wax canvas has content 34685 px
ok   interp?cpu: canvas kept 
ok   interp?cpu: canvas sized and placed 187x299 css 187.2px
all render-path tests passed
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
All five render paths check out—GPU runs correctly with self-check passing, while corrupted output, shader compile failure, no WebGL, and `?cpu` all correctly trigger fallback with a fresh canvas. Here's the full page rendered via the GPU path.

[tool Read]
{
  "file_path": "[workspace]/.t/out/gl_on.png"
}

[tool result]
[image]

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[assistant]
The GPU path composes seamlessly with the static art. Next I'll check layout robustness across devices: small and large phones, landscape, tablet, desktop, and a phone with a bottom safe-area inset.

[tool Write]
{
  "file_path": "[workspace]/.t/t_viewports.js",
  "content": "'use strict';\nconst path = require('path');\nconst { createPage, OUT } = require('./harness.js');\nconst { writePNG } = require('./mock2d.js');\n\nconst configs = [\n  ['se', 320, 568, 2, 0], ['android', 360, 740, 2, 0], ['pixel', 412, 915, 2, 0], ['promax', 430, 932, 2, 0],\n  ['notch', 390, 844, 2, 34], ['landscape', 844, 390, 2, 0], ['tablet', 768, 1024, 1, 0], ['desktop', 1440, 900, 1, 0]\n];\nconst only = process.argv[2] ? process.argv[2].split(',') : null;\nconst results = [];\nfor (const [name, vw, vh, dpr, safe] of configs) {\n  if (only && !only.includes(name)) continue;\n  const page = createPage({ vw, vh, dpr, safeBottom: safe });\n  page.frames(60 * 8);\n  const L = page.win.__lava.layout;\n  const sw = page.els.sw.style;\n  const scale = Math.min(1, 560 / vh, 640 / vw);\n  const img = page.shot(`vp_${name}.png`, scale);\n  const swr = { l: parseFloat(sw.left), t: parseFloat(sw.top), w: parseFloat(sw.width), h: parseFloat(sw.height) };\n  const inside = swr.l >= 0 && swr.t >= 0 && swr.l + swr.w <= vw && swr.t + swr.h <= vh - safe + 0.5;\n  console.log(`${name.padEnd(9)} ${vw}x${vh} dpr${dpr} safe${safe}: u=${L.u.toFixed(2)} stage ${(100 * L.u).toFixed(0)}x${(180 * L.u).toFixed(0)} @ (${L.ox.toFixed(0)},${L.oy.toFixed(0)}) | switch ${swr.w.toFixed(0)}x${swr.h.toFixed(0)} at (${swr.l.toFixed(0)},${swr.t.toFixed(0)}) ${inside ? 'inside' : 'OUTSIDE'} viewport | tap target ${(swr.w + 24).toFixed(0)}x${(swr.h + 24).toFixed(0)}`);\n  results.push({ name, img, vw, vh });\n}\n"
}

[tool result]
File created successfully at: [workspace]/.t/t_viewports.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/t_viewports.js 2>&1 | head -20",
  "description": "Render and check layout across device viewports",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01QWoteEtzMaqH72VBd1fTy9-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01QWoteEtzMaqH72VBd1fTy9","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"fa2b04de-424a-40cc-a854-3787d2df569d"}

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01QWoteEtzMaqH72VBd1fTy9-heartbeat-1","tool_name":"Bash","parent_tool_use_id":"toolu_01QWoteEtzMaqH72VBd1fTy9","elapsed_time_seconds":60,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"a48b1de3-e8f3-4fae-86e3-e14a47ba1646"}

[system]
task_notification

[tool error]
Exit code 1
se        320x568 dpr2 safe0: u=3.16 stage 316x568 @ (2,0) | switch 68x36 at (126,515) inside viewport | tap target 92x60
android   360x740 dpr2 safe0: u=3.60 stage 360x648 @ (0,92) | switch 76x40 at (142,680) inside viewport | tap target 100x64
pixel     412x915 dpr2 safe0: u=4.12 stage 412x742 @ (0,173) | switch 87x45 at (163,846) inside viewport | tap target 111x69
promax    430x932 dpr2 safe0: u=4.30 stage 430x774 @ (0,158) | switch 90x47 at (170,860) inside viewport | tap target 114x71
notch     390x844 dpr2 safe34: u=3.90 stage 390x702 @ (0,114) | switch 82x43 at (154,751) inside viewport | tap target 106x67
landscape 844x390 dpr2 safe0: u=2.17 stage 217x390 @ (314,0) | switch 68x36 at (388,342) inside viewport | tap target 92x60
tablet    768x1024 dpr1 safe0: u=5.69 stage 569x1024 @ (100,0) | switch 119x63 at (324,929) inside viewport | tap target 143x87
desktop   1440x900 dpr1 safe0: u=5.00 stage 500x900 @ (470,0) | switch 105x55 at (668,817) inside viewport | tap target 129x79
zsh:1: operation not permitted: [redacted:local-path]

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[tool Read]
{
  "file_path": "[workspace]/.t/out/vp_landscape.png"
}

[tool result]
[image]

[tool Read]
{
  "file_path": "[workspace]/.t/out/vp_se.png"
}

[tool result]
[image]

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[tool Read]
{
  "file_path": "[workspace]/.t/out/vp_desktop.png"
}

[tool result]
[image]

[tool Read]
{
  "file_path": "[workspace]/.t/out/vp_notch.png"
}

[tool result]
[image]

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[thinking]
Layouts work across all viewports. Now I'll test performance by measuring the CPU fallback path's actual JS cost per frame at various resolutions, isolating the page's code from the mock canvas's copy/blit overhead.

[tool Write]
{
  "file_path": "[workspace]/.t/perf.js",
  "content": "'use strict';\n// Real-time cost of the CPU wax renderer's JS (field accumulation + shading), and of one whole page frame.\nconst { MockCtx } = require('./mock2d.js');\nMockCtx.prototype.putImageData = function () {};      // browser-native in reality; not what we are timing\nMockCtx.prototype.drawImage = function () {};\nMockCtx.prototype.clearRect = function () {};\nconst { createPage } = require('./harness.js');\n\nconst now = () => Number(process.hrtime.bigint()) / 1e6;\nconst page = createPage({ vw: 390, vh: 844, dpr: 2 });\nconst A = page.win.__lava;\nconst wax = A.wax;\nconsole.log('renderer', wax.kind);\nconst w = wax.__w || 0;\nconst cv = page.els.room.children[2];\n// advance the sim to a developed state and pack blobs like the page does\npage.frames(60 * 20);\nfor (const cell of [1.4, 1.8, 2.2, 3, 4.5]) {\n  wax.cellPx = cell;\n  wax.resize(cv.width, cv.height);\n  for (let i = 0; i < 5; i++) wax.draw(A.ub, A.us, 1);          // warm up the JIT\n  const N = 60, t0 = now();\n  for (let i = 0; i < N; i++) wax.draw(A.ub, A.us, 1);\n  const ms = (now() - t0) / N;\n  console.log(`cell ${cell.toFixed(1)} css px -> ${ms.toFixed(2)} ms per draw (V8 on this machine)`);\n}\n// whole frame (sim steps + packing + draw) at the default quality\nwax.cellPx = 2.2; wax.resize(cv.width, cv.height);\nconst t0 = now(), F = 300;\nconst clockStart = page.now;\nfor (let i = 0; i < F; i++) page.frames(1);\nconsole.log(`whole page frame (sim + draw + bookkeeping): ${((now() - t0) / F).toFixed(2)} ms`);\n"
}

[tool result]
File created successfully at: [workspace]/.t/perf.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/perf.js 2>&1 | head -12",
  "description": "Benchmark CPU renderer cost per frame",
  "timeout": 600000
}

[system]
task_started

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task_notification

[tool error]
Exit code 1
renderer cpu
cell 1.4 css px -> 16.77 ms per draw (V8 on this machine)
cell 1.8 css px -> 10.11 ms per draw (V8 on this machine)
cell 2.2 css px -> 6.81 ms per draw (V8 on this machine)
cell 3.0 css px -> 3.67 ms per draw (V8 on this machine)
cell 4.5 css px -> 1.66 ms per draw (V8 on this machine)
whole page frame (sim + draw + bookkeeping): 14.28 ms
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
The CPU fallback is too slow (6.8ms/draw) because it re-shades the entire glass every frame even though most of it is static liquid. I'll cache the liquid layer per light level, skip shading wax-free cells, optimize the hot loop math, and throttle wax updates to 30 Hz.

[tool Bash]
{
  "command": "grep -n \"^function shade\\|^function fieldAt\\|^function makeCPU\\|^const VS\\|Wax shading\\|CPU wax renderer\\|WebGL wax renderer\" index.html",
  "description": "Locate shading and CPU renderer blocks"
}

[tool result]
583:   Wax shading. One implementation in JS (CPU renderer and GPU self-test)
595:function shade(f, gx, gy, tw, x, y, px, light, o) {
653:function fieldAt(ub, us, x, y, out) {
667:   CPU wax renderer (fallback and reference): metaball field on a coarse
670:function makeCPU(canvas) {
738:   WebGL wax renderer: the same field and shading evaluated on the GPU.
740:const VS = 'attribute vec2 p;varying vec2 vUv;void main(){vUv=p*0.5+0.5;gl_Position=vec4(p,0.0,1.0);}';
zsh:1: operation not permitted: [redacted:local-path]

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[tool Read]
{
  "file_path": "[workspace]/index.html",
  "offset": 580,
  "limit": 160
}

[tool result]
580	})();
581	
582	/* ======================================================================
583	   Wax shading. One implementation in JS (CPU renderer and GPU self-test)
584	   and one in GLSL; both evaluate the same metaball field per pixel.
585	   ====================================================================== */
586	const COOL = [0.84, 0.16, 0.30], MID = [1.0, 0.46, 0.14], HOT = [1.0, 0.80, 0.30];
587	const LIQ_TOP = [0.15, 0.06, 0.40], LIQ_BOT = [0.60, 0.18, 0.76], LIQ_OFF = [0.10, 0.09, 0.20];
588	const WAX_OFF = [0.46, 0.21, 0.17], RIM = [1.0, 0.72, 0.55];
589	const LK = [-0.5, 0.6, 0.62], LKN = Math.hypot(LK[0], LK[1], LK[2]);
590	const LKX = LK[0] / LKN, LKY = LK[1] / LKN, LKZ = LK[2] / LKN;
591	const HX = LKX, HY = LKY, HZ = LKZ + 1, HN = Math.hypot(HX, HY, HZ);
592	const HVX = HX / HN, HVY = HY / HN, HVZ = HZ / HN;
593	
594	// o <- premultiplied rgba. f, gx, gy, tw: metaball field, its gradient and temperature-weighted sum.
595	function shade(f, gx, gy, tw, x, y, px, light, o) {
596	  const hw = glassHW(y);
597	  const dE = hw - 0.5 - Math.abs(x);
598	  const aG = clamp(dE / px + 0.5, 0, 1) * clamp((y - GLASS_BOT) / px + 0.5, 0, 1) * clamp((GLASS_TOP - y) / px + 0.5, 0, 1);
599	  if (aG <= 0) { o[0] = o[1] = o[2] = o[3] = 0; return; }
600	
601	  const bulb = Math.exp(-(y + 8) / 34);
602	  const across = 1 - Math.min(x * x / (hw * hw), 1);
603	  const edge = smooth(0, 3, dE);
604	  const glare = Math.exp(-x * x / 80 - (y + 4) * (y + 4) / 120);
605	  const kLit = (0.62 + 0.38 * across) * (0.58 + 0.42 * edge);
606	  const kOff = 0.7 + 0.3 * across;
607	  let r = mix(LIQ_OFF[0] * kOff, mix(LIQ_TOP[0], LIQ_BOT[0], bulb) * kLit + 0.50 * glare, light);
608	  let g = mix(LIQ_OFF[1] * kOff, mix(LIQ_TOP[1], LIQ_BOT[1], bulb) * kLit + 0.30 * glare, light);
609	  let b = mix(LIQ_OFF[2] * kOff, mix(LIQ_TOP[2], LIQ_BOT[2], bulb) * kLit + 0.20 * glare, light);
610	  let a = mix(0.58, 0.95, light);
611	
612	  const fe = f - TH;
613	  if (fe > -0.02) {
614	    const gl = Math.sqrt(gx * gx + gy * gy);
615	    const aw = clamp(fe / (Math.max(gl, 1e-5) * px) + 0.5, 0, 1);
616	    if (aw > 0) {
617	      const tm = tw / Math.max(f, 1e-5);
618	      const fe1 = Math.max(fe, 1e-4);
619	      const h = Math.sqrt(fe1 / (1 - TH));
620	      const inv = 0.5 * DOME / Math.sqrt(fe1 * (1 - TH));
621	      let nx = -gx * inv, ny = -gy * inv;
622	      const nl = Math.sqrt(nx * nx + ny * ny);
623	      if (nl > 4) { nx *= 4 / nl; ny *= 4 / nl; }
624	      const il = 1 / Math.sqrt(nx * nx + ny * ny + 1);
625	      nx *= il; ny *= il;
626	      const nz = il;
627	
628	      let c0, c1, c2;
629	      if (tm < 0.5) { const k = tm * 2; c0 = mix(COOL[0], MID[0], k); c1 = mix(COOL[1], MID[1], k); c2 = mix(COOL[2], MID[2], k); }
630	      else { const k = tm * 2 - 1; c0 = mix(MID[0], HOT[0], k); c1 = mix(MID[1], HOT[1], k); c2 = mix(MID[2], HOT[2], k); }
631	      c0 = mix(WAX_OFF[0], c0, light); c1 = mix(WAX_OFF[1], c1, light); c2 = mix(WAX_OFF[2], c2, light);
632	
633	      const dKey = Math.max(nx * LKX + ny * LKY + nz * LKZ, 0);
634	      const bx = -x, by = -(y + 14), bz = 10, bl = Math.sqrt(bx * bx + by * by + bz * bz);
635	      const dBulb = Math.max((nx * bx + ny * by + nz * bz) / bl, 0);
636	      const glow = (0.42 + 0.62 * Math.min(h, 1.2)) * (0.50 + 0.70 * bulb);
637	      const lit = glow + 0.50 * dBulb * bulb + 0.14 * dKey;
638	      const off = 0.26 + 0.55 * dKey + 0.12 * nz;
639	      const shade_ = mix(off, lit, light);
640	      const rim = Math.pow(1 - nz, 3) * 0.5 * (0.35 + 0.65 * bulb) * light;
641	      const spec = Math.pow(Math.max(nx * HVX + ny * HVY + nz * HVZ, 0), 40) * 0.5 * (0.3 + 0.7 * light);
642	      const wr = c0 * shade_ + RIM[0] * rim + spec;
643	      const wg = c1 * shade_ + RIM[1] * rim + spec;
644	      const wb = c2 * shade_ + RIM[2] * rim + spec;
645	      r = mix(r, wr, aw); g = mix(g, wg, aw); b = mix(b, wb, aw); a = mix(a, 1, aw);
646	    }
647	  }
648	  a *= aG;
649	  o[0] = Math.min(r, 1) * a; o[1] = Math.min(g, 1) * a; o[2] = Math.min(b, 1) * a; o[3] = a;
650	}
651	
652	// brute-force field at a sim point (used by the GPU self-test)
653	function fieldAt(ub, us, x, y, out) {
654	  let f = 0, gx = 0, gy = 0, tw = 0;
655	  for (let i = 0; i < N; i++) {
656	    const s = us[i], dx = x - ub[i * 4], dy = y - ub[i * 4 + 1], R = K * ub[i * 4 + 2];
657	    const q = (dx * dx * s + dy * dy / s) / (R * R);
658	    if (q < 1) {
659	      const m = 1 - q, w = m * m * m, k = -6 * m * m / (R * R);
660	      f += w; tw += w * ub[i * 4 + 3]; gx += k * dx * s; gy += k * dy / s;
661	    }
662	  }
663	  out[0] = f; out[1] = gx; out[2] = gy; out[3] = tw;
664	}
665	
666	/* ======================================================================
667	   CPU wax renderer (fallback and reference): metaball field on a coarse
668	   grid, shaded per cell, then smoothly upscaled by drawImage.
669	   ====================================================================== */
670	function makeCPU(canvas) {
671	  const ctx = canvas.getContext('2d');
672	  if (!ctx) return null;
673	  const small = doc.createElement('canvas'), sctx = small.getContext('2d');
674	  let gw = 0, gh = 0, csx = 1, csy = 1, img = null, F, GX, GY, TW, cw = 0, ch = 0;
675	  const px = [0, 0, 0, 0];
676	  const self = {
677	    kind: 'cpu', cellPx: 2.2, minCell: 1.4, maxCell: 4.5, ms: 0,
678	    resize(w, h) {
679	      cw = canvas.width = w; ch = canvas.height = h;
680	      const cs = self.cellPx / L.u;
681	      gw = Math.max(8, Math.round(WW / cs)); gh = Math.max(8, Math.round(WH / cs));
682	      small.width = gw; small.height = gh;
683	      img = sctx.createImageData(gw, gh);
684	      F = new Float32Array(gw * gh); GX = new Float32Array(gw * gh); GY = new Float32Array(gw * gh); TW = new Float32Array(gw * gh);
685	      csx = WW / gw; csy = WH / gh;
686	    },
687	    draw(ub, us, light) {
688	      const t0 = win.performance.now();
689	      F.fill(0); GX.fill(0); GY.fill(0); TW.fill(0);
690	      for (let b = 0; b < N; b++) {
691	        const bx = ub[b * 4], by = ub[b * 4 + 1], R = K * ub[b * 4 + 2], bt = ub[b * 4 + 3], s = us[b], R2 = R * R;
692	        const rx = R / Math.sqrt(s), ry = R * Math.sqrt(s);
693	        const i0 = Math.max(0, Math.floor((bx - rx - WX0) / csx)), i1 = Math.min(gw - 1, Math.ceil((bx + rx - WX0) / csx));
694	        const j0 = Math.max(0, Math.floor((WY1 - (by + ry)) / csy)), j1 = Math.min(gh - 1, Math.ceil((WY1 - (by - ry)) / csy));
695	        for (let j = j0; j <= j1; j++) {
696	          const dy = WY1 - (j + 0.5) * csy - by, dyq = dy * dy / s;
697	          for (let i = i0; i <= i1; i++) {
698	            const dx = WX0 + (i + 0.5) * csx - bx;
699	            const q = (dx * dx * s + dyq) / R2;
700	            if (q < 1) {
701	              const m = 1 - q, w = m * m * m, k = -6 * m * m / R2, o = j * gw + i;
702	              F[o] += w; TW[o] += w * bt; GX[o] += k * dx * s; GY[o] += k * dy / s;
703	            }
704	          }
705	        }
706	      }
707	      const d = img.data, pxu = (csx + csy) / 2;
708	      for (let j = 0; j < gh; j++) {
709	        const y = WY1 - (j + 0.5) * csy;
710	        for (let i = 0; i < gw; i++) {
711	          const o = j * gw + i, x = WX0 + (i + 0.5) * csx;
712	          shade(F[o], GX[o], GY[o], TW[o], x, y, pxu, light, px);
713	          const a = px[3], p = o * 4;
714	          if (a > 0) { d[p] = px[0] / a * 255; d[p + 1] = px[1] / a * 255; d[p + 2] = px[2] / a * 255; d[p + 3] = a * 255; }
715	          else { d[p] = d[p + 1] = d[p + 2] = d[p + 3] = 0; }
716	        }
717	      }
718	      sctx.putImageData(img, 0, 0);
719	      ctx.clearRect(0, 0, cw, ch);
720	      ctx.imageSmoothingEnabled = true;
721	      ctx.drawImage(small, 0, 0, cw, ch);
722	      self.ms += (win.performance.now() - t0 - self.ms) * 0.1;
723	    },
724	    // trade resolution for speed when the frame cost climbs
725	    adapt() {
726	      const c = self.cellPx;
727	      if (self.ms > 6.5 && c < self.maxCell) self.cellPx = Math.min(self.maxCell, c * 1.25);
728	      else if (self.ms < 2 && c > self.minCell) self.cellPx = Math.max(self.minCell, c / 1.15);
729	      else return false;
730	      self.resize(cw, ch);
731	      return true;
732	    }
733	  };
734	  return self;
735	}
736	
737	/* ======================================================================
738	   WebGL wax renderer: the same field and shading evaluated on the GPU.
739	   ====================================================================== */

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[tool Write]
{
  "file_path": "[workspace]/.t/newshade.js",
  "content": "/* ======================================================================\n   Wax shading. One implementation in JS (CPU renderer and GPU self-test)\n   and one in GLSL; both evaluate the same metaball field per pixel.\n   ====================================================================== */\nconst COOL = [0.84, 0.16, 0.30], MID = [1.0, 0.46, 0.14], HOT = [1.0, 0.80, 0.30];\nconst LIQ_TOP = [0.15, 0.06, 0.40], LIQ_BOT = [0.60, 0.18, 0.76], LIQ_OFF = [0.10, 0.09, 0.20];\nconst WAX_OFF = [0.46, 0.21, 0.17], RIM = [1.0, 0.72, 0.55];\nconst LK = [-0.5, 0.6, 0.62], LKN = Math.hypot(LK[0], LK[1], LK[2]);\nconst LKX = LK[0] / LKN, LKY = LK[1] / LKN, LKZ = LK[2] / LKN;\nconst HX = LKX, HY = LKY, HZ = LKZ + 1, HN = Math.hypot(HX, HY, HZ);\nconst HVX = HX / HN, HVY = HY / HN, HVZ = HZ / HN;\n\n// The glass and the liquid in it at a point: o <- [r, g, b, liquid opacity, glass coverage].\n// None of this depends on the wax, only on the light level.\nfunction liquidAt(x, y, px, light, o) {\n  const hw = glassHW(y);\n  const dE = hw - 0.5 - Math.abs(x);\n  o[4] = clamp(dE / px + 0.5, 0, 1) * clamp((y - GLASS_BOT) / px + 0.5, 0, 1) * clamp((GLASS_TOP - y) / px + 0.5, 0, 1);\n  const bulb = Math.exp(-(y + 8) / 34);\n  const across = 1 - Math.min(x * x / (hw * hw), 1);\n  const edge = smooth(0, 3, dE);\n  const glare = Math.exp(-x * x / 80 - (y + 4) * (y + 4) / 120);\n  const kLit = (0.62 + 0.38 * across) * (0.58 + 0.42 * edge);\n  const kOff = 0.7 + 0.3 * across;\n  o[0] = mix(LIQ_OFF[0] * kOff, mix(LIQ_TOP[0], LIQ_BOT[0], bulb) * kLit + 0.50 * glare, light);\n  o[1] = mix(LIQ_OFF[1] * kOff, mix(LIQ_TOP[1], LIQ_BOT[1], bulb) * kLit + 0.30 * glare, light);\n  o[2] = mix(LIQ_OFF[2] * kOff, mix(LIQ_TOP[2], LIQ_BOT[2], bulb) * kLit + 0.20 * glare, light);\n  o[3] = mix(0.58, 0.95, light);\n}\n\n// The wax over that liquid, clipped to the glass: o <- premultiplied rgba.\n// f, gx, gy, tw: the metaball field, its gradient and its temperature-weighted sum; q: liquidAt's result.\nfunction waxOver(f, gx, gy, tw, x, y, px, light, q, o) {\n  const aG = q[4];\n  if (aG <= 0) { o[0] = o[1] = o[2] = o[3] = 0; return; }\n  let r = q[0], g = q[1], b = q[2], a = q[3];\n  const fe = f - TH;\n  if (fe > -0.02) {\n    const aw = clamp(fe / (Math.max(Math.sqrt(gx * gx + gy * gy), 1e-5) * px) + 0.5, 0, 1);\n    if (aw > 0) {\n      const bulb = Math.exp(-(y + 8) / 34);\n      const tm = tw / Math.max(f, 1e-5);\n      const fe1 = Math.max(fe, 1e-4);\n      const h = Math.sqrt(fe1 / (1 - TH));                // height of the dome: 0 at the rim, 1 at the heart of a blob\n      const inv = 0.5 * DOME / Math.sqrt(fe1 * (1 - TH));\n      let nx = -gx * inv, ny = -gy * inv;                 // surface normal tilts away from the centre\n      const nl = Math.sqrt(nx * nx + ny * ny);\n      if (nl > 4) { nx *= 4 / nl; ny *= 4 / nl; }\n      const nz = 1 / Math.sqrt(nx * nx + ny * ny + 1);\n      nx *= nz; ny *= nz;\n\n      let c0, c1, c2;                                     // wax colour follows its temperature\n      if (tm < 0.5) { const k = tm * 2; c0 = mix(COOL[0], MID[0], k); c1 = mix(COOL[1], MID[1], k); c2 = mix(COOL[2], MID[2], k); }\n      else { const k = tm * 2 - 1; c0 = mix(MID[0], HOT[0], k); c1 = mix(MID[1], HOT[1], k); c2 = mix(MID[2], HOT[2], k); }\n      c0 = mix(WAX_OFF[0], c0, light); c1 = mix(WAX_OFF[1], c1, light); c2 = mix(WAX_OFF[2], c2, light);\n\n      const dKey = Math.max(nx * LKX + ny * LKY + nz * LKZ, 0);\n      const bx = -x, by = -(y + 14), bz = 10, bl = Math.sqrt(bx * bx + by * by + bz * bz);\n      const dBulb = Math.max((nx * bx + ny * by + nz * bz) / bl, 0);\n      const glow = (0.42 + 0.62 * Math.min(h, 1.2)) * (0.50 + 0.70 * bulb);\n      const lit = glow + 0.50 * dBulb * bulb + 0.14 * dKey;\n      const off = 0.26 + 0.55 * dKey + 0.12 * nz;\n      const body = mix(off, lit, light);\n      const e = 1 - nz, rim = e * e * e * 0.5 * (0.35 + 0.65 * bulb) * light;   // back-lit edge\n      let s = Math.max(nx * HVX + ny * HVY + nz * HVZ, 0);                       // glossy highlight: s ** 40\n      s *= s; s *= s; s *= s; const s8 = s; s *= s; s *= s; s *= s8;\n      const spec = s * 0.5 * (0.3 + 0.7 * light);\n      r = mix(r, c0 * body + RIM[0] * rim + spec, aw);\n      g = mix(g, c1 * body + RIM[1] * rim + spec, aw);\n      b = mix(b, c2 * body + RIM[2] * rim + spec, aw);\n      a = mix(a, 1, aw);\n    }\n  }\n  a *= aG;\n  o[0] = Math.min(r, 1) * a; o[1] = Math.min(g, 1) * a; o[2] = Math.min(b, 1) * a; o[3] = a;\n}\n\nconst Q = [0, 0, 0, 0, 0];\nfunction shade(f, gx, gy, tw, x, y, px, light, o) {      // the whole pixel; the GLSL shader computes exactly this\n  liquidAt(x, y, px, light, Q);\n  waxOver(f, gx, gy, tw, x, y, px, light, Q, o);\n}\n\n// brute-force field at a sim point (used by the GPU self-test)\nfunction fieldAt(ub, us, x, y, out) {\n  let f = 0, gx = 0, gy = 0, tw = 0;\n  for (let i = 0; i < N; i++) {\n    const s = us[i], dx = x - ub[i * 4], dy = y - ub[i * 4 + 1], R = K * ub[i * 4 + 2];\n    const q = (dx * dx * s + dy * dy / s) / (R * R);\n    if (q < 1) {\n      const m = 1 - q, w = m * m * m, k = -6 * m * m / (R * R);\n      f += w; tw += w * ub[i * 4 + 3]; gx += k * dx * s; gy += k * dy / s;\n    }\n  }\n  out[0] = f; out[1] = gx; out[2] = gy; out[3] = tw;\n}\n\n/* ======================================================================\n   CPU wax renderer (fallback): metaball field on a coarse grid, shaded\n   only where there is wax, then smoothly upscaled by drawImage. It trades\n   resolution and then update rate for speed when the device is slow.\n   ====================================================================== */\nfunction makeCPU(canvas) {\n  const ctx = canvas.getContext('2d');\n  if (!ctx) return null;\n  const small = doc.createElement('canvas'), sctx = small.getContext('2d');\n  let gw = 0, gh = 0, csx = 1, csy = 1, img = null, F, GX, GY, TW, LQ, base, cw = 0, ch = 0, lit = NaN;\n  const q = [0, 0, 0, 0, 0], px = [0, 0, 0, 0];\n\n  // glass and liquid only change with the light level, so they are shaded once per level, not once per frame\n  function liquid(light) {\n    const pxu = (csx + csy) / 2;\n    for (let j = 0; j < gh; j++) {\n      const y = WY1 - (j + 0.5) * csy;\n      for (let i = 0; i < gw; i++) {\n        const o = j * gw + i, p = o * 4, k = o * 5;\n        liquidAt(WX0 + (i + 0.5) * csx, y, pxu, light, q);\n        LQ[k] = q[0]; LQ[k + 1] = q[1]; LQ[k + 2] = q[2]; LQ[k + 3] = q[3]; LQ[k + 4] = q[4];\n        base[p] = q[0] * 255; base[p + 1] = q[1] * 255; base[p + 2] = q[2] * 255; base[p + 3] = q[3] * q[4] * 255;\n      }\n    }\n    lit = light;\n  }\n\n  const self = {\n    kind: 'cpu', cellPx: 2.2, minCell: 1.5, maxCell: 3.8, skip: 1, ms: 0,\n    resize(w, h) {\n      cw = canvas.width = w; ch = canvas.height = h;\n      const cs = self.cellPx / L.u;\n      gw = Math.max(8, Math.round(WW / cs)); gh = Math.max(8, Math.round(WH / cs));\n      small.width = gw; small.height = gh;\n      img = sctx.createImageData(gw, gh);\n      F = new Float32Array(gw * gh); GX = new Float32Array(gw * gh); GY = new Float32Array(gw * gh); TW = new Float32Array(gw * gh);\n      LQ = new Float32Array(gw * gh * 5); base = new Uint8ClampedArray(gw * gh * 4);\n      csx = WW / gw; csy = WH / gh; lit = NaN;\n    },\n    draw(ub, us, light) {\n      const t0 = win.performance.now();\n      if (light !== lit) liquid(light);\n      const d = img.data;\n      d.set(base);\n      F.fill(0); GX.fill(0); GY.fill(0); TW.fill(0);\n      let rowLo = gh, rowHi = -1;\n      for (let b = 0; b < N; b++) {\n        const bx = ub[b * 4], by = ub[b * 4 + 1], R = K * ub[b * 4 + 2], bt = ub[b * 4 + 3], s = us[b], R2 = R * R;\n        const rx = R / Math.sqrt(s), ry = R * Math.sqrt(s);\n        const i0 = Math.max(0, Math.floor((bx - rx - WX0) / csx)), i1 = Math.min(gw - 1, Math.ceil((bx + rx - WX0) / csx));\n        const j0 = Math.max(0, Math.floor((WY1 - (by + ry)) / csy)), j1 = Math.min(gh - 1, Math.ceil((WY1 - (by - ry)) / csy));\n        if (j0 < rowLo) rowLo = j0;\n        if (j1 > rowHi) rowHi = j1;\n        for (let j = j0; j <= j1; j++) {\n          const dy = WY1 - (j + 0.5) * csy - by, dyq = dy * dy / s;\n          for (let i = i0; i <= i1; i++) {\n            const dx = WX0 + (i + 0.5) * csx - bx;\n            const qq = (dx * dx * s + dyq) / R2;\n            if (qq < 1) {\n              const m = 1 - qq, w = m * m * m, k = -6 * m * m / R2, o = j * gw + i;\n              F[o] += w; TW[o] += w * bt; GX[o] += k * dx * s; GY[o] += k * dy / s;\n            }\n          }\n        }\n      }\n      const pxu = (csx + csy) / 2, cut = TH - 0.02;\n      for (let j = rowLo; j <= rowHi; j++) {\n        const y = WY1 - (j + 0.5) * csy, row = j * gw;\n        for (let i = 0; i < gw; i++) {\n          const o = row + i, f = F[o];\n          if (f <= cut) continue;\n          const k = o * 5;\n          q[0] = LQ[k]; q[1] = LQ[k + 1]; q[2] = LQ[k + 2]; q[3] = LQ[k + 3]; q[4] = LQ[k + 4];\n          waxOver(f, GX[o], GY[o], TW[o], WX0 + (i + 0.5) * csx, y, pxu, light, q, px);\n          const a = px[3], p = o * 4;\n          if (a > 0) { d[p] = px[0] / a * 255; d[p + 1] = px[1] / a * 255; d[p + 2] = px[2] / a * 255; d[p + 3] = a * 255; }\n          else { d[p] = d[p + 1] = d[p + 2] = d[p + 3] = 0; }\n        }\n      }\n      sctx.putImageData(img, 0, 0);\n      ctx.clearRect(0, 0, cw, ch);\n      ctx.imageSmoothingEnabled = true;\n      ctx.drawImage(small, 0, 0, cw, ch);\n      self.ms += (win.performance.now() - t0 - self.ms) * 0.1;\n    },\n    // Called now and then with the measured cost: coarser cells first, then every 2nd/3rd frame (wax drifts slowly\n    // enough that this is hard to see); finer again when there is headroom. Returns true if the canvas was resized.\n    adapt(slow) {\n      const c = self.cellPx, over = self.ms > 5 || slow;\n      if (over && c < self.maxCell) self.cellPx = Math.min(self.maxCell, c * 1.25);\n      else if (over && self.skip < 3) { self.skip++; return false; }\n      else if (!over && self.skip > 1 && self.ms < 2.5) { self.skip--; return false; }\n      else if (!over && self.skip === 1 && self.ms < 3.2 && c > self.minCell) self.cellPx = Math.max(self.minCell, c / 1.15);\n      else return false;\n      self.resize(cw, ch);\n      return true;\n    }\n  };\n  return self;\n}\n\n"
}

[tool result]
File created successfully at: [workspace]/.t/newshade.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nconst lines=fs.readFileSync('index.html','utf8').split('\\n');\nconst a=lines.findIndex(l=>l.startsWith('   Wax shading. One implementation'))-1;\nconst b=lines.findIndex(l=>l.startsWith('   WebGL wax renderer: the same field'))-1;\nif(a<0||b<0||!lines[a].startsWith('/* ====')||!lines[b].startsWith('/* ====')) throw new Error('markers '+a+' '+b);\nconst nb=fs.readFileSync('.t/newshade.js','utf8').replace(/\\n+$/,'').split('\\n');\nlines.splice(a,b-a,...nb,'');\nfs.writeFileSync('index.html',lines.join('\\n'));\nconsole.log('replaced',a+1,'..',b,'with',nb.length);\n\" 2>&1 | head -3",
  "description": "Splice optimized shading and CPU renderer"
}

[tool error]
Exit code 1
replaced 582 .. 736 with 197
zsh:11: operation not permitted: [redacted:local-path]

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[assistant]
Now I'll wire frame skipping and the "page is missing frames" signal into the main loop:

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "let last = 0, relayoutPending = false, frames = 0, hudT = 0, hudN = 0, slow = 0, dtAvg = 1 / 60;\n\n// trade wax resolution for speed if this device cannot keep up (the canvas is redrawn in the same frame)\nfunction adaptQuality(dtRaw) {\n  if (dtRaw < 0.1) dtAvg += (dtRaw - dtAvg) * 0.05;\n  if (!wax || ++frames < 90 || frames % 45) return;\n  if (wax.kind === 'cpu') { if (wax.adapt()) dirty = true; }\n  else if (dtAvg > 0.0215) {\n    if (++slow >= 2 && waxQual > 0.55) { waxQual *= 0.8; placeWax(); slow = 0; dirty = true; }\n  } else slow = 0;\n}",
  "new_string": "let last = 0, relayoutPending = false, frames = 0, tick = 0, hudT = 0, hudN = 0, slow = 0, dtAvg = 1 / 60;\n\n// trade wax quality for speed if this device cannot keep up (the canvas is redrawn in the same frame)\nfunction adaptQuality(dtRaw) {\n  if (dtRaw < 0.1) dtAvg += (dtRaw - dtAvg) * 0.05;\n  if (!wax || ++frames < 90 || frames % 45) return;\n  const missing = dtAvg > 0.0215;                       // well short of 60 fps\n  if (wax.kind === 'cpu') { if (wax.adapt(missing)) dirty = true; }\n  else if (missing) {\n    if (++slow >= 2 && waxQual > 0.55) { waxQual *= 0.8; placeWax(); slow = 0; dirty = true; }\n  } else slow = 0;\n}"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (note: the file had been modified on disk since you last read it — the edit applied cleanly, but the file contains other changes not in your context. Read it before edits that depend on surrounding content.)

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "  const moving = packBlobs();\n  if (dirty || moving || sim.power || sim.heater > 0.01) { drawWax(); dirty = false; }",
  "new_string": "  const moving = packBlobs();\n  if (dirty || moving || sim.power || sim.heater > 0.01) {\n    if (dirty || !wax || ++tick >= (wax.skip || 1)) { tick = 0; drawWax(); dirty = false; }   // a slow CPU renderer may draw every 2nd or 3rd frame\n  }"
}

[tool result]
The file [workspace]/index.html has been updated successfully.

[tool Bash]
{
  "command": "node .t/glsl_check.js 80 0,13 1,0.4,0 2>&1 | tail -9; node .t/perf.js 2>&1 | head -8",
  "description": "Re-verify GLSL parity and re-measure CPU cost",
  "timeout": 600000
}

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[tool error]
Exit code 1
fragment shader (mediump) type-checks
vertex shader type-checks
t=0s light=1: 80x128 px in 68 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.1,72.7 | NaN 0 | wax px 1069
t=0s light=0.4: 80x128 px in 67 ms | mean |diff| 0.00000 | max |diff| 0.0001 at 8.1,72.7 | NaN 0 | wax px 1069
t=0s light=0: 80x128 px in 65 ms | mean |diff| 0.00000 | max |diff| 0.0001 at -8.1,72.7 | NaN 0 | wax px 1069
t=13s light=1: 80x128 px in 62 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.1,72.7 | NaN 0 | wax px 1196
t=13s light=0.4: 80x128 px in 60 ms | mean |diff| 0.00000 | max |diff| 0.0001 at 8.1,72.7 | NaN 0 | wax px 1196
t=13s light=0: 80x128 px in 60 ms | mean |diff| 0.00000 | max |diff| 0.0001 at -8.1,72.7 | NaN 0 | wax px 1196
GLSL output matches the JS reference
renderer cpu
cell 1.4 css px -> 2.96 ms per draw (V8 on this machine)
cell 1.8 css px -> 1.81 ms per draw (V8 on this machine)
cell 2.2 css px -> 1.20 ms per draw (V8 on this machine)
cell 3.0 css px -> 0.66 ms per draw (V8 on this machine)
cell 4.5 css px -> 0.29 ms per draw (V8 on this machine)
whole page frame (sim + draw + bookkeeping): 2.37 ms
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
The restructure cut CPU renderer cost roughly 6× (6.8ms→1.2ms at default resolution, 16.8ms→3ms at finest), and GLSL parity still passes. Now I'll test the adaptive logic against emulated slow devices by scaling the page's clock.

[tool Write]
{
  "file_path": "[workspace]/.t/t_adapt.js",
  "content": "'use strict';\n// Emulate slower devices by scaling the clock the page uses to time its own draw calls.\nconst { MockCtx } = require('./mock2d.js');\nMockCtx.prototype.putImageData = function () {};\nMockCtx.prototype.drawImage = function () {};\nMockCtx.prototype.clearRect = function () {};\nconst { createPage } = require('./harness.js');\nconst real = () => Number(process.hrtime.bigint()) / 1e6;\n\nfor (const factor of [1, 4, 8, 16]) {\n  const page = createPage({ vw: 390, vh: 844, dpr: 2 });\n  const win = page.win;\n  win.performance.now = () => real() * factor;                     // the page sees a device 'factor' times slower\n  const log = [];\n  for (let sec = 0; sec <= 30; sec += 5) {\n    if (sec) page.frames(300);                                     // 5 s of frames\n    const w = win.__lava.wax;\n    log.push(`${sec}s: cell ${w.cellPx.toFixed(2)} skip ${w.skip} ms ${w.ms.toFixed(1)}`);\n  }\n  console.log(`device ${factor}x slower:\\n  ` + log.join('\\n  '));\n}\n"
}

[tool result]
File created successfully at: [workspace]/.t/t_adapt.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/t_adapt.js 2>&1 | head -40",
  "description": "Test adaptive quality under emulated slow devices",
  "timeout": 900000
}

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[tool error]
Exit code 1
device 1x slower:
  0s: cell 2.20 skip 1 ms 0.0
  5s: cell 1.50 skip 1 ms 2.8
  10s: cell 1.50 skip 1 ms 2.6
  15s: cell 1.50 skip 1 ms 2.7
  20s: cell 1.50 skip 1 ms 2.8
  25s: cell 1.50 skip 1 ms 2.7
  30s: cell 1.50 skip 1 ms 2.8
device 4x slower:
  0s: cell 2.20 skip 1 ms 0.0
  5s: cell 2.75 skip 1 ms 3.3
  10s: cell 2.39 skip 1 ms 4.3
  15s: cell 2.60 skip 1 ms 3.6
  20s: cell 2.60 skip 1 ms 3.5
  25s: cell 2.60 skip 1 ms 3.6
  30s: cell 2.60 skip 1 ms 3.8
device 8x slower:
  0s: cell 2.20 skip 1 ms 0.0
  5s: cell 3.44 skip 1 ms 4.3
  10s: cell 3.44 skip 1 ms 4.0
  15s: cell 3.80 skip 1 ms 3.4
  20s: cell 3.80 skip 1 ms 3.3
  25s: cell 3.30 skip 1 ms 4.5
  30s: cell 3.30 skip 1 ms 4.7
device 16x slower:
  0s: cell 2.20 skip 1 ms 0.0
  5s: cell 3.80 skip 3 ms 7.1
  10s: cell 3.80 skip 3 ms 6.7
  15s: cell 3.80 skip 3 ms 7.1
  20s: cell 3.80 skip 3 ms 6.6
  25s: cell 3.80 skip 3 ms 6.7
  30s: cell 3.80 skip 3 ms 7.1
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
Adaptation is working well: fast devices refine to the finest grid, slower ones settle at coarser cells to keep draw cost under ~5ms, and a very slow device falls back to coarse cells with every-third-frame updates. Next I'll run an end-to-end interaction test covering rapid toggling, mid-run resizes, orientation flips, DPR changes, and WebGL context loss/restore.

[tool Write]
{
  "file_path": "[workspace]/.t/t_interact.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nlet bad = 0;\nconst ok = (name, cond, extra) => { if (!cond) { bad++; console.log('FAIL', name, extra || ''); } else console.log('ok  ', name, extra || ''); };\nconst nonEmpty = (c) => { let n = 0; for (let i = 3; i < c._buf.length; i += 4) if (c._buf[i] > 0.5) n++; return n; };\n\n// ---- CPU path\n{\n  const page = createPage({ vw: 390, vh: 844, dpr: 2 });\n  const A = page.win.__lava, sw = page.els.sw;\n  ok('starts on', sw.getAttribute('aria-checked') === 'true' && A.sim.power === 1);\n  page.frames(30);\n  page.click();\n  ok('click turns it off', sw.getAttribute('aria-checked') === 'false' && A.sim.power === 0);\n  page.frames(180);\n  ok('light faded out', parseFloat(page.els.glow.style.opacity) < 0.01 && parseFloat(page.els.lit.style.opacity) < 0.01, page.els.glow.style.opacity);\n  page.click();\n  ok('click turns it back on', sw.getAttribute('aria-checked') === 'true' && A.sim.power === 1);\n  page.frames(180);\n  ok('light faded in', parseFloat(page.els.glow.style.opacity) > 0.99, page.els.glow.style.opacity);\n\n  for (let i = 0; i < 11; i++) { page.click(); page.frames(3); }\n  ok('rapid toggling stays consistent', sw.getAttribute('aria-checked') === (A.sim.power ? 'true' : 'false'));\n  page.frames(60);\n\n  // resize / rotate / zoom while running\n  for (const [w, h, d] of [[844, 390, 2], [390, 844, 2], [320, 568, 3], [1440, 900, 1], [390, 844, 2]]) {\n    page.resize(w, h, d);\n    page.frames(2);\n    const wc = page.els.room.children[2], L = A.layout;\n    ok(`resize ${w}x${h}@${d}: layout + wax canvas drawn`, L.vw === w && L.vh === h && nonEmpty(wc) > 500 && wc.width > 8, `u=${L.u.toFixed(2)} wax px ${nonEmpty(wc)}`);\n    const bg = page.els.bg;\n    ok(`resize ${w}x${h}@${d}: bg canvas sized`, bg.width === Math.round(w * Math.min(d, 2)) || Math.abs(bg.width - w * Math.min(d, 2)) <= 1, bg.width + 'x' + bg.height);\n  }\n  // time passing with the lamp off: should go idle (wax stops being redrawn) without errors\n  page.click(); page.frames(60 * 90);\n  const c = page.els.room.children[2];\n  const before = c._buf.slice(0, 4000);\n  page.frames(30);\n  let same = true; for (let i = 0; i < before.length; i++) if (c._buf[i] !== before[i]) { same = false; break; }\n  ok('settled lamp is static (idle, no redraw churn)', same);\n  page.click(); page.frames(30);\n  ok('wakes from idle', A.sim.power === 1);\n\n  // frame-time robustness: huge gaps (tab was hidden) must not explode the sim\n  const y0 = Array.from(A.sim.y);\n  page.frames(1, 5000);\n  ok('5 s frame gap is clamped', Array.from(A.sim.y).every((v, i) => isFinite(v) && Math.abs(v - y0[i]) < 12), '');\n  page.frames(60 * 20);\n  ok('sim stays finite and inside the glass', Array.from(A.sim.x).every(isFinite) && Array.from(A.sim.y).every(v => v >= 0 && v <= 72));\n}\n\n// ---- GPU path: context loss and restore, and loss that never recovers\n{\n  const page = createPage({ vw: 390, vh: 844, dpr: 1, glMode: 'interp' });\n  const A = page.win.__lava;\n  page.frames(2);\n  ok('gl: starts on the GPU path', A.wax.kind === 'gl');\n  const glCanvas = page.els.room.children[2];\n  let prevented = false;\n  glCanvas.listeners.webglcontextlost[0]({ preventDefault() { prevented = true; } });\n  ok('gl: context loss is handled (preventDefault, renderer dropped)', prevented && A.wax === null);\n  page.frames(5);                                            // frames while lost must not throw\n  glCanvas.listeners.webglcontextrestored[0]({});\n  page.frames(2);\n  ok('gl: context restore brings the GPU renderer back and draws', A.wax && A.wax.kind === 'gl' && nonEmpty(page.els.room.children[2]) > 500);\n\n  let timer = null;\n  page.win.setTimeout = (fn) => { timer = fn; return 1; };\n  glCanvas.listeners.webglcontextlost[0]({ preventDefault() {} });\n  page.frames(2);\n  ok('gl: a lost context schedules a fallback', typeof timer === 'function');\n  timer();                                                   // 1.5 s passed and the context never came back\n  page.frames(2);\n  ok('gl: falls back to the CPU renderer on a fresh canvas', A.wax && A.wax.kind === 'cpu' && page.els.room.children[2] !== glCanvas && nonEmpty(page.els.room.children[2]) > 500);\n}\nconsole.log(bad ? `${bad} FAILED` : 'all interaction tests passed');\nprocess.exitCode = bad ? 1 : 0;\n"
}

[tool result]
File created successfully at: [workspace]/.t/t_interact.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/t_interact.js 2>&1 | head -50",
  "description": "Run interaction, resize and context-loss tests",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_012TCZdbd13kcjUVm1S1GUuD-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_012TCZdbd13kcjUVm1S1GUuD","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"7b2d7914-6b99-494e-9f67-c976fd750b09"}

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_012TCZdbd13kcjUVm1S1GUuD-heartbeat-1","tool_name":"Bash","parent_tool_use_id":"toolu_012TCZdbd13kcjUVm1S1GUuD","elapsed_time_seconds":60,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"c40ba243-5e37-4238-818a-f349de4fc4f7"}

[system]
task_notification

[tool error]
Exit code 1
FAIL starts on 
ok   click turns it off 
FAIL light faded out 0.014
ok   click turns it back on 
ok   light faded in 1
ok   rapid toggling stays consistent 
ok   resize 844x390@2: layout + wax canvas drawn u=2.17 wax px 42028
ok   resize 844x390@2: bg canvas sized 1688x780
ok   resize 390x844@2: layout + wax canvas drawn u=3.90 wax px 137050
ok   resize 390x844@2: bg canvas sized 780x1688
ok   resize 320x568@3: layout + wax canvas drawn u=3.16 wax px 89593
ok   resize 320x568@3: bg canvas sized 640x1136
ok   resize 1440x900@1: layout + wax canvas drawn u=5.00 wax px 56566
ok   resize 1440x900@1: bg canvas sized 1440x900
ok   resize 390x844@2: layout + wax canvas drawn u=3.90 wax px 136980
ok   resize 390x844@2: bg canvas sized 780x1688
ok   settled lamp is static (idle, no redraw churn) 
FAIL wakes from idle 
ok   5 s frame gap is clamped 
ok   sim stays finite and inside the glass 
ok   gl: starts on the GPU path 
ok   gl: context loss is handled (preventDefault, renderer dropped) 
ok   gl: context restore brings the GPU renderer back and draws 
ok   gl: a lost context schedules a fallback 
ok   gl: falls back to the CPU renderer on a fresh canvas 
3 FAILED
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
Found three test issues: the mock button lacks an initial aria-checked, the fade threshold is stricter than the intended 0.7s constant, and the idle check uses the wrong pixel region with miscounted parity. I'll fix the test to count actual draw calls and adjust the fade timing to 0.35s on and 0.5s off.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "  const target = sim.power, lt = target > light ? 0.45 : 0.7;",
  "new_string": "  const target = sim.power, lt = target > light ? 0.35 : 0.5;"
}

[tool result]
The file [workspace]/index.html has been updated successfully.

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet s=fs.readFileSync('.t/t_interact.js','utf8');\ns=s.replace(\\\"ok('starts on', sw.getAttribute('aria-checked') === 'true' && A.sim.power === 1);\\\", \\\"ok('starts on', A.sim.power === 1);\\\");\ns=s.replace(\\\"< 0.01 && parseFloat(page.els.lit.style.opacity) < 0.01\\\", \\\"< 0.01 && parseFloat(page.els.lit.style.opacity) < 0.01\\\");\nconst a=s.indexOf('  // time passing with the lamp off');\nconst b=s.indexOf('  // frame-time robustness');\nconst nb=\\`  // time passing with the lamp off: it should go idle (no wax redraws at all) and wake again on demand\n  A.setPower(false); page.frames(60 * 90);\n  let draws = 0; const w0 = A.wax, orig = w0.draw; w0.draw = (...a) => { draws++; return orig(...a); };\n  page.frames(60);\n  ok('settled, switched-off lamp stops redrawing the wax', draws === 0, draws + ' draws in 60 frames');\n  A.setPower(true); page.frames(30);\n  ok('switching on wakes it up and redraws every frame', draws >= 25, draws + ' draws in 30 frames');\n  w0.draw = orig;\n\n\\`;\ns=s.slice(0,a)+nb+s.slice(b);\nfs.writeFileSync('.t/t_interact.js',s);\n\" 2>&1 | head -3; node .t/t_interact.js 2>&1 | grep -v \"^ok\" | head",
  "description": "Fix interaction tests and re-run",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01NcEeD4XTcPKbrBQThCh8mf-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01NcEeD4XTcPKbrBQThCh8mf","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"9e55c821-5607-4f38-a846-bae2144c8793"}

[system]
task_notification

[tool error]
Exit code 1
FAIL settled, switched-off lamp stops redrawing the wax 60 draws in 60 frames
1 FAILED
zsh:20: operation not permitted: [redacted:local-path]

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[thinking]
Found the issue: the wax's lateral "meander" motion keeps running even when cold, since it's not tied to heat, causing endless redraws. I'll scale the meander by heater level so cold wax stops drifting, letting the renderer go idle once settled.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "      tvx[i] = P.lane * (lane - x[i]) + P.wander * Math.sin(s.time * wf[i] + ph[i]);\n    }",
  "new_string": "      tvx[i] = W * (P.lane * (lane - x[i]) + P.wander * Math.sin(s.time * wf[i] + ph[i]));   // cold wax sits still\n    }"
}

[tool result]
The file [workspace]/index.html has been updated successfully.

[tool Bash]
{
  "command": "node .t/t_interact.js 2>&1 | grep -v \"^ok\" | head; node .t/simlab.js '{}' '{\"T\":400}' 2>&1 | head -3",
  "description": "Re-run interaction tests and sim health",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01G7WxNe4axeZrPusS2yXUGj-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01G7WxNe4axeZrPusS2yXUGj","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"49b6d5be-ede9-43aa-8e1b-51b38efa3595"}

[system]
task_notification

[tool error]
Exit code 1
FAIL settled, switched-off lamp stops redrawing the wax 60 draws in 60 frames
1 FAILED
components 4.48  merges/min 24.4  splits/min 24.4  moving 85%  y-hist(10u bins) 19,13,13,13,13,14,15  nan false
y range per blob: 4-67 3-67 3-68 3-68 2-69 2-68 3-66 3-66 2-67
zsh:1: operation not permitted: [redacted:local-path]

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[tool Write]
{
  "file_path": "[workspace]/.t/dbg_idle.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nconst page = createPage({ vw: 390, vh: 844, dpr: 1 });\nconst A = page.win.__lava, s = A.sim;\nA.setPower(false);\npage.frames(60 * 90);\nconsole.log('power', s.power, 'heater', s.heater.toExponential(2));\nconsole.log('vx', Array.from(s.vx).map(v => v.toExponential(1)).join(' '));\nconsole.log('vy', Array.from(s.vy).map(v => v.toExponential(1)).join(' '));\nconsole.log('y ', Array.from(s.y).map(v => v.toFixed(2)).join(' '));\nconsole.log('T ', Array.from(s.T).map(v => v.toExponential(1)).join(' '));\n"
}

[tool result]
File created successfully at: [workspace]/.t/dbg_idle.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/dbg_idle.js 2>&1 | head",
  "description": "Inspect state after long switch-off",
  "timeout": 300000
}

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task_started

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task_notification

[tool error]
Exit code 1
power 0 heater 2.32e-16
vx 3.0e-2 8.0e-3 1.1e-15 1.4e-1 -1.0e-1 -7.9e-2 -2.5e-1 3.1e-2 1.2e-1
vy -5.5e-2 0.0e+0 -2.2e-1 0.0e+0 -3.7e-2 0.0e+0 0.0e+0 0.0e+0 0.0e+0
y  3.91 3.41 3.04 2.73 2.48 2.23 1.98 1.74 1.55
T  4.7e-12 4.5e-12 6.6e-12 6.1e-12 1.8e-12 2.7e-12 3.1e-12 3.3e-12 2.7e-12
zsh:1: operation not permitted: [redacted:local-path]

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[tool Write]
{
  "file_path": "[workspace]/.t/dbg_idle.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nconst page = createPage({ vw: 390, vh: 844, dpr: 1 });\nconst A = page.win.__lava, s = A.sim, N = s.x.length;\nA.setPower(false);\npage.frames(60 * 90);\nconst snap = () => Array.from(s.x).map(v => v.toFixed(3)).join(' ');\nconsole.log('x before', snap());\npage.frames(60 * 10);\nconsole.log('x after 10s', snap());\nconsole.log('vx', Array.from(s.vx).map(v => v.toFixed(3)).join(' '));\nconsole.log('pairs with 0.7 < u < 1.45 (cohesion active):');\nfor (let i = 0; i < N; i++) for (let j = i + 1; j < N; j++) {\n  const dx = s.x[j] - s.x[i], dy = s.y[j] - s.y[i], rs = s.r[i] + s.r[j], u = Math.hypot(dx, dy) / rs;\n  if (u < 1.45) console.log(`  ${i}-${j} u=${u.toFixed(3)} dx=${dx.toFixed(2)} dy=${dy.toFixed(2)}`);\n}\n"
}

[tool result]
The file [workspace]/.t/dbg_idle.js has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/dbg_idle.js 2>&1 | head -30",
  "description": "Inspect which pairs keep the settled pile moving",
  "timeout": 300000
}

[system]
task_started

[system]
task_notification

[tool error]
Exit code 1
x before -3.194 -0.888 1.157 -4.979 4.147 2.649 5.499 0.340 -0.704
x after 10s -3.194 -0.888 1.157 -4.979 4.147 2.649 5.499 0.340 -0.704
vx 0.030 0.008 -0.000 0.144 -0.104 -0.079 -0.246 0.031 0.119
pairs with 0.7 < u < 1.45 (cohesion active):
  0-1 u=0.200 dx=2.31 dy=-0.50
  0-2 u=0.396 dx=4.35 dy=-0.87
  0-3 u=0.200 dx=-1.79 dy=-1.18
  0-4 u=0.726 dx=7.34 dy=-1.43
  0-5 u=0.614 dx=5.84 dy=-1.67
  0-6 u=0.937 dx=8.69 dy=-1.92
  0-7 u=0.456 dx=3.53 dy=-2.17
  0-8 u=0.389 dx=2.49 dy=-2.36
  1-2 u=0.200 dx=2.04 dy=-0.37
  1-3 u=0.419 dx=-4.09 dy=-0.68
  1-4 u=0.539 dx=5.04 dy=-0.93
  1-5 u=0.410 dx=3.54 dy=-1.18
  1-6 u=0.752 dx=6.39 dy=-1.43
  1-7 u=0.250 dx=1.23 dy=-1.67
  1-8 u=0.234 dx=0.18 dy=-1.86
  2-3 u=0.661 dx=-6.14 dy=-0.31
  2-4 u=0.342 dx=2.99 dy=-0.56
  2-5 u=0.200 dx=1.49 dy=-0.81
  2-6 u=0.552 dx=4.34 dy=-1.05
  2-7 u=0.200 dx=-0.82 dy=-1.30
  2-8 u=0.322 dx=-1.86 dy=-1.49
  3-4 u=1.087 dx=9.13 dy=-0.25
  3-5 u=0.956 dx=7.63 dy=-0.50
  3-6 u=1.382 dx=10.48 dy=-0.74
  3-7 u=0.751 dx=5.32 dy=-0.99
  3-8 u=0.643 dx=4.28 dy=-1.18
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
The pile looks static but lingering velocity from the cohesion/separation stalemate is tricking the renderer into showing motion, so I'll fix this by detecting motion from actual render value changes instead of velocity, and make radius wobble scale with heater temperature.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "function packBlobs() {                                  // sim state -> renderer inputs; true while anything is still moving\n  const { x, y, r, T, st, vx, vy, ph, time } = sim;\n  let moving = false;\n  for (let i = 0; i < N; i++) {\n    const o = i * 4;\n    ub[o] = x[i]; ub[o + 1] = y[i]; ub[o + 2] = r[i] * (1 + 0.03 * Math.sin(time * 1.1 + ph[i])); ub[o + 3] = T[i];\n    us[i] = st[i];\n    if (Math.abs(vx[i]) + Math.abs(vy[i]) > 0.01) moving = true;\n  }\n  return moving;\n}",
  "new_string": "function packBlobs() {                                  // sim state -> renderer inputs; true if anything visibly changed\n  const { x, y, r, T, st, ph, time, heater } = sim;\n  const wob = 0.03 * heater;                            // warm wax quivers a little; cold wax is still\n  let changed = false;\n  const put = (a, k, v) => { if (Math.abs(a[k] - v) > 2e-4) changed = true; a[k] = v; };\n  for (let i = 0; i < N; i++) {\n    const o = i * 4;\n    put(ub, o, x[i]); put(ub, o + 1, y[i]); put(ub, o + 2, r[i] * (1 + wob * Math.sin(time * 1.1 + ph[i]))); put(ub, o + 3, T[i]);\n    put(us, i, st[i]);\n  }\n  return changed;\n}"
}

[tool result]
The file [workspace]/index.html has been updated successfully.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "  const moving = packBlobs();\n  if (dirty || moving || sim.power || sim.heater > 0.01) {\n    if (dirty || !wax || ++tick >= (wax.skip || 1)) { tick = 0; drawWax(); dirty = false; }   // a slow CPU renderer may draw every 2nd or 3rd frame\n  }",
  "new_string": "  if (packBlobs()) dirty = true;                        // nothing to redraw once the cold wax has settled\n  if (dirty || sim.power) {\n    if (!wax || ++tick >= (wax.skip || 1) || sim.power === 0) { tick = 0; drawWax(); dirty = false; }   // a slow CPU renderer may draw every 2nd or 3rd frame\n  }"
}

[tool result]
The file [workspace]/index.html has been updated successfully.

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[thinking]
My quick edit muddled the redraw logic, so I'll explicitly separate it into two flags: `force` for when the canvas appearance changed and must draw, and `dirty` for mere movement that slow renderers can skip.

[tool Bash]
{
  "command": "grep -n \"dirty\" index.html",
  "description": "List all uses of the dirty flag"
}

[tool result]
972:let wax = null, waxQual = 1, swPos = 1, light = 1, dirty = true;
1032:          win.setTimeout(() => { if (!wax) { useCPU(true); placeWax(); dirty = true; } }, 1500);   // never came back: carry on without the GPU
1034:        waxC.addEventListener('webglcontextrestored', () => { initWax(); placeWax(); dirty = true; }, false);
1048:  dirty = true;
1087:  if (wax.kind === 'cpu') { if (wax.adapt(missing)) dirty = true; }
1089:    if (++slow >= 2 && waxQual > 0.55) { waxQual *= 0.8; placeWax(); slow = 0; dirty = true; }
1109:    light = nl; dirty = true;
1116:  if (packBlobs()) dirty = true;                        // nothing to redraw once the cold wax has settled
1117:  if (dirty || sim.power) {
1118:    if (!wax || ++tick >= (wax.skip || 1) || sim.power === 0) { tick = 0; drawWax(); dirty = false; }   // a slow CPU renderer may draw every 2nd or 3rd frame
zsh:1: operation not permitted: [redacted:local-path]

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[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet s=fs.readFileSync('index.html','utf8');\nconst rep=(a,b)=>{ if(!s.includes(a)) throw new Error('missing: '+a); s=s.replace(a,b); };\nrep('let wax = null, waxQual = 1, swPos = 1, light = 1, dirty = true;', 'let wax = null, waxQual = 1, swPos = 1, light = 1;\\nlet dirty = true, force = true;                        // dirty: wax moved; force: its canvas was cleared, redraw this very frame');\nrep('if (!wax) { useCPU(true); placeWax(); dirty = true; } }, 1500);', 'if (!wax) { useCPU(true); placeWax(); force = true; } }, 1500);');\nrep(\\\"waxC.addEventListener('webglcontextrestored', () => { initWax(); placeWax(); dirty = true; }, false);\\\", \\\"waxC.addEventListener('webglcontextrestored', () => { initWax(); placeWax(); force = true; }, false);\\\");\nrep('  if (wax) placeWax();\\n  dirty = true;\\n}', '  if (wax) placeWax();\\n  force = true;\\n}');\nrep('if (wax.adapt(missing)) dirty = true; }', 'if (wax.adapt(missing)) force = true; }');\nrep('placeWax(); slow = 0; dirty = true; }', 'placeWax(); slow = 0; force = true; }');\nrep(\\\"  if (packBlobs()) dirty = true;                        // nothing to redraw once the cold wax has settled\\n  if (dirty || sim.power) {\\n    if (!wax || ++tick >= (wax.skip || 1) || sim.power === 0) { tick = 0; drawWax(); dirty = false; }   // a slow CPU renderer may draw every 2nd or 3rd frame\\n  }\\\", \\\"  if (packBlobs()) dirty = true;                        // once the cold wax has settled nothing is redrawn at all\\n  if (force || (dirty && ++tick >= (wax ? wax.skip || 1 : 1))) { tick = 0; drawWax(); dirty = force = false; }   // a slow CPU renderer may draw every 2nd or 3rd frame\\\");\nfs.writeFileSync('index.html',s);\nconsole.log('ok');\n\" 2>&1 | head -3; grep -n \"dirty\\|force\" index.html | head -20",
  "description": "Apply dirty/force redraw flags consistently"
}

[tool error]
Exit code 1
ok
665:// brute-force field at a sim point (used by the GPU self-test)
969:const forceCPU = /[?&#]cpu\b/.test(qs);
973:let dirty = true, force = true;                        // dirty: wax moved; force: its canvas was cleared, redraw this very frame
1025:  if (!forceCPU) {
1033:          win.setTimeout(() => { if (!wax) { useCPU(true); placeWax(); force = true; } }, 1500);   // never came back: carry on without the GPU
1035:        waxC.addEventListener('webglcontextrestored', () => { initWax(); placeWax(); force = true; }, false);
1049:  force = true;
1088:  if (wax.kind === 'cpu') { if (wax.adapt(missing)) force = true; }
1090:    if (++slow >= 2 && waxQual > 0.55) { waxQual *= 0.8; placeWax(); slow = 0; force = true; }
1110:    light = nl; dirty = true;
1117:  if (packBlobs()) dirty = true;                        // once the cold wax has settled nothing is redrawn at all
1118:  if (force || (dirty && ++tick >= (wax ? wax.skip || 1 : 1))) { tick = 0; drawWax(); dirty = force = false; }   // a slow CPU renderer may draw every 2nd or 3rd frame
zsh:14: operation not permitted: [redacted:local-path]

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[tool Bash]
{
  "command": "node .t/t_interact.js 2>&1 | grep -v \"^ok\" | head; node .t/t_gl.js 2>&1 | grep -v \"^ok\" | head -5",
  "description": "Re-run interaction and render-path tests",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01AvSt3A7hPWNkPwZMCqUxEW-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01AvSt3A7hPWNkPwZMCqUxEW","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"54a7d98f-befd-4cf9-b4fa-65acfc115ba0"}

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01AvSt3A7hPWNkPwZMCqUxEW-heartbeat-1","tool_name":"Bash","parent_tool_use_id":"toolu_01AvSt3A7hPWNkPwZMCqUxEW","elapsed_time_seconds":60,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"fcf84299-f4b7-40bb-a50d-216fa9fca945"}

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01AvSt3A7hPWNkPwZMCqUxEW-heartbeat-2","tool_name":"Bash","parent_tool_use_id":"toolu_01AvSt3A7hPWNkPwZMCqUxEW","elapsed_time_seconds":90,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"0883364c-d7ca-4cb2-a881-6ddf9bef821b"}

[system]
task_notification

[tool error]
Exit code 1
FAIL settled, switched-off lamp stops redrawing the wax 60 draws in 60 frames
1 FAILED
all render-path tests passed
zsh:1: operation not permitted: [redacted:local-path]

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[tool Write]
{
  "file_path": "[workspace]/.t/dbg_idle.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nconst page = createPage({ vw: 390, vh: 844, dpr: 1 });\nconst A = page.win.__lava, s = A.sim, N = s.x.length;\nA.setPower(false);\npage.frames(60 * 90);\nconst a = Float32Array.from(A.ub), sa = Float32Array.from(A.us);\npage.frames(1);\nconst b = A.ub, sb = A.us;\nfor (let k = 0; k < a.length; k++) if (Math.abs(a[k] - b[k]) > 2e-4) console.log('ub[' + k + '] (blob ' + (k >> 2) + ' field ' + 'xyrT'[k & 3] + ')', a[k], '->', b[k]);\nfor (let k = 0; k < sa.length; k++) if (Math.abs(sa[k] - sb[k]) > 2e-4) console.log('us[' + k + ']', sa[k], '->', sb[k]);\nconsole.log('heater', s.heater, 'light style', page.els.glow.style.opacity);\nconsole.log('sim.x', Array.from(s.x).map(v => v.toFixed(4)).join(' '));\npage.frames(1);\nconsole.log('sim.x', Array.from(s.x).map(v => v.toFixed(4)).join(' '));\n"
}

[tool result]
The file [workspace]/.t/dbg_idle.js has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/dbg_idle.js 2>&1 | head -20",
  "description": "Find what keeps changing in the idle lamp",
  "timeout": 300000
}

[system]
task_started

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[tool error]
Exit code 1
ub[9] (blob 2 field y) 3.0384013652801514 -> 3.0387649536132812
ub[28] (blob 7 field x) 0.3395009934902191 -> 0.33927470445632935
us[2] 0.6562725305557251 -> 0.6560409069061279
heater 2.304110775304116e-16 light style 0
sim.x -3.1935 -0.8881 1.1570 -4.9793 4.1474 2.6495 5.4987 0.3393 -0.7045
sim.x -3.1935 -0.8880 1.1570 -4.9793 4.1473 2.6493 5.4988 0.3395 -0.7042
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
The issue is sub-pixel jitter from the constraint solver falsely triggering redraws against my threshold. I'll fix this by comparing against the last values actually rendered rather than the previous frame, so real drift still accumulates to trigger a redraw while jitter won't.

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet s=fs.readFileSync('index.html','utf8');\nconst rep=(a,b)=>{ if(!s.includes(a)) throw new Error('missing: '+a.slice(0,60)); s=s.replace(a,b); };\nrep('const ub = new Float32Array(N * 4), us = new Float32Array(N);', 'const ub = new Float32Array(N * 4), us = new Float32Array(N);       // what the renderer is given\\nconst ubDrawn = new Float32Array(N * 4), usDrawn = new Float32Array(N);   // what it was last given');\nrep(\\\"function packBlobs() {                                  // sim state -> renderer inputs; true if anything visibly changed\\\", \\\"function packBlobs() {                                  // sim state -> renderer inputs; true if the picture would visibly change\\\");\nrep('const put = (a, k, v) => { if (Math.abs(a[k] - v) > 2e-4) changed = true; a[k] = v; };', 'const put = (a, d, k, v) => { a[k] = v; if (Math.abs(d[k] - v) > 2e-3) changed = true; };   // slow drift adds up; solver jitter never shows');\nrep('put(ub, o, x[i]); put(ub, o + 1, y[i]); put(ub, o + 2, r[i] * (1 + wob * Math.sin(time * 1.1 + ph[i]))); put(ub, o + 3, T[i]);\\n    put(us, i, st[i]);', 'put(ub, ubDrawn, o, x[i]); put(ub, ubDrawn, o + 1, y[i]); put(ub, ubDrawn, o + 2, r[i] * (1 + wob * Math.sin(time * 1.1 + ph[i]))); put(ub, ubDrawn, o + 3, T[i]);\\n    put(us, usDrawn, i, st[i]);');\nrep('  wax.draw(ub, us, light);\\n}\\n\\nlet last', '  wax.draw(ub, us, light);\\n  ubDrawn.set(ub); usDrawn.set(us);\\n}\\n\\nlet last');\nfs.writeFileSync('index.html',s);\nconsole.log('ok');\n\" 2>&1 | head -3; node .t/t_interact.js 2>&1 | grep -v \"^ok\" | head -5; node .t/t_gl.js 2>&1 | tail -1",
  "description": "Compare against last-drawn values for idle detection",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01Pyxw2KZZLkprYWeRLyGDkL-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01Pyxw2KZZLkprYWeRLyGDkL","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"68a59272-147d-4188-87b5-38c4827e0141"}

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01Pyxw2KZZLkprYWeRLyGDkL-heartbeat-1","tool_name":"Bash","parent_tool_use_id":"toolu_01Pyxw2KZZLkprYWeRLyGDkL","elapsed_time_seconds":60,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"499e4503-98e1-4580-859d-911aaea3809e"}

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01Pyxw2KZZLkprYWeRLyGDkL-heartbeat-2","tool_name":"Bash","parent_tool_use_id":"toolu_01Pyxw2KZZLkprYWeRLyGDkL","elapsed_time_seconds":90,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"8ee993ec-6888-4b21-8705-bf8d1e9b882e"}

[system]
task_notification

[tool error]
Exit code 1
ok
FAIL settled, switched-off lamp stops redrawing the wax 24 draws in 60 frames
1 FAILED
all render-path tests passed
zsh:12: operation not permitted: [redacted:local-path]

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[tool Write]
{
  "file_path": "[workspace]/.t/dbg_idle.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nconst page = createPage({ vw: 390, vh: 844, dpr: 1 });\nconst A = page.win.__lava, s = A.sim, N = s.x.length;\nA.setPower(false);\npage.frames(60 * 90);\nlet snapU = null, snapS = null, draws = 0;\nconst w = A.wax, orig = w.draw;\nw.draw = (ub, us, l) => { draws++; snapU = Float32Array.from(ub); snapS = Float32Array.from(us); return orig(ub, us, l); };\nconst why = {};\nfor (let f = 0; f < 120; f++) {\n  page.frames(1);\n  if (!snapU) continue;\n  for (let k = 0; k < A.ub.length; k++) if (Math.abs(A.ub[k] - snapU[k]) > 1.5e-3) why['ub' + 'xyrT'[k & 3] + (k >> 2)] = (why['ub' + 'xyrT'[k & 3] + (k >> 2)] || 0) + 1;\n  for (let k = 0; k < A.us.length; k++) if (Math.abs(A.us[k] - snapS[k]) > 1.5e-3) why['st' + k] = (why['st' + k] || 0) + 1;\n}\nconsole.log('draws in 120 frames', draws, 'triggers', JSON.stringify(why));\nconsole.log('vx', Array.from(s.vx).map(v => v.toFixed(3)).join(' '));\nconsole.log('vy', Array.from(s.vy).map(v => v.toFixed(3)).join(' '));\n"
}

[tool result]
The file [workspace]/.t/dbg_idle.js has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/dbg_idle.js 2>&1 | head",
  "description": "Find which values trigger redraws while idle",
  "timeout": 300000
}

[system]
task_started

[system]
task_notification

[tool error]
Exit code 1
draws in 120 frames 0 triggers {}
vx 0.030 0.008 0.000 0.144 -0.104 -0.079 -0.246 0.031 0.119
vy -0.055 0.000 -0.220 0.000 -0.037 0.000 0.000 0.000 0.000
zsh:1: operation not permitted: [redacted:local-path]

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[tool Write]
{
  "file_path": "[workspace]/.t/dbg_idle2.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nconst page = createPage({ vw: 390, vh: 844, dpr: 2 });\nconst A = page.win.__lava, s = A.sim, N = s.x.length;\npage.frames(30); page.click(); page.frames(180); page.click(); page.frames(180);\nfor (let i = 0; i < 11; i++) { page.click(); page.frames(3); }\npage.frames(60);\nfor (const [w, h, d] of [[844, 390, 2], [390, 844, 2], [320, 568, 3], [1440, 900, 1], [390, 844, 2]]) { page.resize(w, h, d); page.frames(2); }\nA.setPower(false); page.frames(60 * 90);\nlet snapU = null, snapS = null, draws = 0;\nconst w = A.wax, orig = w.draw;\nw.draw = (ub, us, l) => { draws++; snapU = Float32Array.from(ub); snapS = Float32Array.from(us); return orig(ub, us, l); };\nconst why = {};\nfor (let f = 0; f < 120; f++) {\n  page.frames(1);\n  if (!snapU) continue;\n  for (let k = 0; k < A.ub.length; k++) if (Math.abs(A.ub[k] - snapU[k]) > 1.5e-3) { const key = 'ub' + 'xyrT'[k & 3] + (k >> 2); why[key] = (why[key] || 0) + 1; }\n  for (let k = 0; k < A.us.length; k++) if (Math.abs(A.us[k] - snapS[k]) > 1.5e-3) why['st' + k] = (why['st' + k] || 0) + 1;\n}\nconsole.log('draws in 120 frames', draws, 'triggers', JSON.stringify(why), 'heater', s.heater, 'light', page.els.glow.style.opacity);\nconsole.log('vx', Array.from(s.vx).map(v => v.toFixed(3)).join(' '));\nconsole.log('vy', Array.from(s.vy).map(v => v.toFixed(3)).join(' '));\nconsole.log('T ', Array.from(s.T).map(v => v.toExponential(1)).join(' '));\n"
}

[tool result]
File created successfully at: [workspace]/.t/dbg_idle2.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/dbg_idle2.js 2>&1 | head",
  "description": "Reproduce the idle failure with the test's history",
  "timeout": 300000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_012s6B5DetyppHw1KroZ75aD-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_012s6B5DetyppHw1KroZ75aD","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"f8b9093b-3dd3-4f69-9236-1700f748354d"}

[system]
task_notification

[tool error]
Exit code 1
draws in 120 frames 48 triggers {} heater 5.596478523196729e-17 light 0
vx -0.000 0.064 -0.042 0.046 -0.008 0.046 -0.000 -0.347 0.067
vy 0.000 0.000 -0.304 0.000 0.000 -0.041 0.000 0.000 0.000
T  1.1e-12 1.1e-12 1.6e-12 2.6e-12 7.1e-13 8.6e-13 1.4e-12 1.8e-12 6.3e-13
zsh:1: operation not permitted: [redacted:local-path]

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[tool Bash]
{
  "command": "cat >> .t/dbg_idle2.js <<'EOF'\nEOF\nnode -e \"\nconst fs=require('fs');\nlet s=fs.readFileSync('.t/dbg_idle2.js','utf8');\ns+='\\nconsole.log(\\\"skip\\\", A.wax.skip, \\\"cell\\\", A.wax.cellPx, \\\"ms\\\", A.wax.ms);\\n';\nfs.writeFileSync('.t/dbg_idle2.js',s);\n\" ; node .t/dbg_idle2.js 2>&1 | tail -2",
  "description": "Print the CPU renderer's adaptive state",
  "timeout": 300000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_0159jUQGreQkh7TXdwAuafDU-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_0159jUQGreQkh7TXdwAuafDU","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"fe195b76-e314-4e64-93ea-17ac8c00be27"}

[system]
task_notification

[tool error]
Exit code 1
(eval):1: can't create temp file for here document: operation not permitted
----- Native stack trace -----

 1: 0x1053da30c node::InitializeOncePerProcessInternal(std::__1::vector, std::__1::allocator>, std::__1::allocator, std::__1::allocator>>> const&, node::ProcessInitializationFlags::Flags) [/opt/homebrew/Cellar/node@22/22.23.4/lib/libnode.127.dylib]
 2: 0x1053dae78 node::Start(int, char**) [/opt/homebrew/Cellar/node@22/22.23.4/lib/libnode.127.dylib]
 3: 0x195eebe80 start [/usr/lib/dyld]
vy 0.000 0.000 -0.304 0.000 0.000 -0.041 0.000 0.000 0.000
T  1.1e-12 1.1e-12 1.6e-12 2.6e-12 7.1e-13 8.6e-13 1.4e-12 1.8e-12 6.3e-13
zsh:8: operation not permitted: [redacted:local-path]

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[assistant]
That stray heredoc was a slip. Heredocs fail in this sandbox, and the Node flake hit the first call. Let me redo it properly using the Edit tool:

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/.t/dbg_idle2.js",
  "old_string": "console.log('T ', Array.from(s.T).map(v => v.toExponential(1)).join(' '));",
  "new_string": "console.log('T ', Array.from(s.T).map(v => v.toExponential(1)).join(' '));\nconsole.log('skip', A.wax.skip, 'cell', A.wax.cellPx, 'ms', A.wax.ms);"
}

[tool result]
The file [workspace]/.t/dbg_idle2.js has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/dbg_idle2.js 2>&1 | tail -3",
  "description": "Print the CPU renderer's adaptive state",
  "timeout": 300000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01EdCXs2pQtCTeHBXf1PpNDY-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01EdCXs2pQtCTeHBXf1PpNDY","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"11795299-d661-462d-a121-10274b42e71f"}

[system]
task_notification

[tool error]
Exit code 1
vy 0.000 0.000 -0.304 0.000 0.000 -0.041 0.000 0.000 0.000
T  1.1e-12 1.1e-12 1.6e-12 2.6e-12 7.1e-13 8.6e-13 1.4e-12 1.8e-12 6.3e-13
skip 1 cell 1.5 ms 0
zsh:1: operation not permitted: [redacted:local-path]

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[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "win.__lava = { sim, setPower, shade, fieldAt, VS, FS, get wax() { return wax; }, get layout() { return L; }, ub, us };",
  "new_string": "win.__lava = { sim, setPower, shade, fieldAt, VS, FS, get wax() { return wax; }, get layout() { return L; }, ub, us, ubDrawn, usDrawn, get flags() { return [dirty, force, tick]; } };"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (note: the file had been modified on disk since you last read it — the edit applied cleanly, but the file contains other changes not in your context. Read it before edits that depend on surrounding content.)

[tool Write]
{
  "file_path": "[workspace]/.t/dbg_idle3.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nconst page = createPage({ vw: 390, vh: 844, dpr: 2 });\nconst A = page.win.__lava, s = A.sim;\npage.frames(30); page.click(); page.frames(180); page.click(); page.frames(180);\nfor (let i = 0; i < 11; i++) { page.click(); page.frames(3); }\npage.frames(60);\nfor (const [w, h, d] of [[844, 390, 2], [390, 844, 2], [320, 568, 3], [1440, 900, 1], [390, 844, 2]]) { page.resize(w, h, d); page.frames(2); }\nA.setPower(false); page.frames(60 * 90);\nconst w = A.wax, orig = w.draw;\nlet n = 0;\nw.draw = (...a) => { n++; return orig(...a); };\nfor (let f = 0; f < 40; f++) {\n  const before = A.flags.slice();\n  page.frames(1);\n  let worst = 0, wk = -1;\n  for (let k = 0; k < A.ub.length; k++) { const d = Math.abs(A.ub[k] - A.ubDrawn[k]); if (d > worst) { worst = d; wk = k; } }\n  for (let k = 0; k < A.us.length; k++) { const d = Math.abs(A.us[k] - A.usDrawn[k]); if (d > worst) { worst = d; wk = 100 + k; } }\n  console.log(`frame ${f}: flags before ${before} after ${A.flags} draws so far ${n} worst |ub-drawn| ${worst.toExponential(2)} at ${wk}`);\n}\n"
}

[tool result]
File created successfully at: [workspace]/.t/dbg_idle3.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/dbg_idle3.js 2>&1 | head -45",
  "description": "Trace redraw flags frame by frame while idle",
  "timeout": 300000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01QoxJDsJPwFhLqAjaXg9Tmh-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01QoxJDsJPwFhLqAjaXg9Tmh","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"69bc7d56-66e5-4129-ac96-0cdaac560cd8"}

[system]
task_notification

[tool error]
Exit code 1
frame 0: flags before false,false,0 after false,false,0 draws so far 1 worst |ub-drawn| 0.00e+0 at -1
frame 1: flags before false,false,0 after false,false,0 draws so far 1 worst |ub-drawn| 8.14e-4 at 9
frame 2: flags before false,false,0 after false,false,0 draws so far 2 worst |ub-drawn| 0.00e+0 at -1
frame 3: flags before false,false,0 after false,false,0 draws so far 2 worst |ub-drawn| 8.10e-4 at 28
frame 4: flags before false,false,0 after false,false,0 draws so far 2 worst |ub-drawn| 7.63e-4 at 28
frame 5: flags before false,false,0 after false,false,0 draws so far 3 worst |ub-drawn| 0.00e+0 at -1
frame 6: flags before false,false,0 after false,false,0 draws so far 3 worst |ub-drawn| 8.14e-4 at 9
frame 7: flags before false,false,0 after false,false,0 draws so far 4 worst |ub-drawn| 0.00e+0 at -1
frame 8: flags before false,false,0 after false,false,0 draws so far 4 worst |ub-drawn| 8.10e-4 at 28
frame 9: flags before false,false,0 after false,false,0 draws so far 4 worst |ub-drawn| 7.63e-4 at 28
frame 10: flags before false,false,0 after false,false,0 draws so far 5 worst |ub-drawn| 0.00e+0 at -1
frame 11: flags before false,false,0 after false,false,0 draws so far 5 worst |ub-drawn| 8.14e-4 at 9
frame 12: flags before false,false,0 after false,false,0 draws so far 6 worst |ub-drawn| 0.00e+0 at -1
frame 13: flags before false,false,0 after false,false,0 draws so far 6 worst |ub-drawn| 8.10e-4 at 28
frame 14: flags before false,false,0 after false,false,0 draws so far 6 worst |ub-drawn| 7.63e-4 at 28
frame 15: flags before false,false,0 after false,false,0 draws so far 7 worst |ub-drawn| 0.00e+0 at -1
frame 16: flags before false,false,0 after false,false,0 draws so far 7 worst |ub-drawn| 8.14e-4 at 9
frame 17: flags before false,false,0 after false,false,0 draws so far 8 worst |ub-drawn| 0.00e+0 at -1
frame 18: flags before false,false,0 after false,false,0 draws so far 8 worst |ub-drawn| 8.10e-4 at 28
frame 19: flags before false,false,0 after false,false,0 draws so far 8 worst |ub-drawn| 7.63e-4 at 28
frame 20: flags before false,false,0 after false,false,0 draws so far 9 worst |ub-drawn| 0.00e+0 at -1
frame 21: flags before false,false,0 after false,false,0 draws so far 9 worst |ub-drawn| 8.14e-4 at 9
frame 22: flags before false,false,0 after false,false,0 draws so far 10 worst |ub-drawn| 0.00e+0 at -1
frame 23: flags before false,false,0 after false,false,0 draws so far 10 worst |ub-drawn| 8.10e-4 at 28
frame 24: flags before false,false,0 after false,false,0 draws so far 10 worst |ub-drawn| 7.63e-4 at 28
frame 25: flags before false,false,0 after false,false,0 draws so far 11 worst |ub-drawn| 0.00e+0 at -1
frame 26: flags before false,false,0 after false,false,0 draws so far 11 worst |ub-drawn| 8.14e-4 at 9
frame 27: flags before false,false,0 after false,false,0 draws so far 12 worst |ub-drawn| 0.00e+0 at -1
frame 28: flags before false,false,0 after false,false,0 draws so far 12 worst |ub-drawn| 8.10e-4 at 28
frame 29: flags before false,false,0 after false,false,0 draws so far 12 worst |ub-drawn| 7.63e-4 at 28
frame 30: flags before false,false,0 after false,false,0 draws so far 13 worst |ub-drawn| 0.00e+0 at -1
frame 31: flags before false,false,0 after false,false,0 draws so far 13 worst |ub-drawn| 8.14e-4 at 9
frame 32: flags before false,false,0 after false,false,0 draws so far 14 worst |ub-drawn| 0.00e+0 at -1
frame 33: flags before false,false,0 after false,false,0 draws so far 14 worst |ub-drawn| 8.10e-4 at 28
frame 34: flags before false,false,0 after false,false,0 draws so far 14 worst |ub-drawn| 7.63e-4 at 28
frame 35: flags before false,false,0 after false,false,0 draws so far 15 worst |ub-drawn| 0.00e+0 at -1
frame 36: flags before false,false,0 after false,false,0 draws so far 15 worst |ub-drawn| 8.14e-4 at 9
frame 37: flags before false,false,0 after false,false,0 draws so far 16 worst |ub-drawn| 0.00e+0 at -1
frame 38: flags before false,false,0 after false,false,0 draws so far 16 worst |ub-drawn| 8.10e-4 at 28
frame 39: flags before false,false,0 after false,false,0 draws so far 16 worst |ub-drawn| 7.63e-4 at 28
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
Found it: cohesion and the minimum-separation constraint are fighting, creating a tiny oscillation (~0.002 units) that just exceeds the redraw threshold. I'll fix this by limiting cohesion to warm wax only and tightening the change threshold a bit, keeping it well under a pixel.

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet s=fs.readFileSync('index.html','utf8');\nconst rep=(a,b)=>{ if(!s.includes(a)) throw new Error('missing: '+a.slice(0,70)); s=s.replace(a,b); };\nrep('const sp = P.cohesion * Math.sin(Math.PI * q);', 'const sp = P.cohesion * W * Math.sin(Math.PI * q);');\nrep('if (Math.abs(d[k] - v) > 2e-3) changed = true; };', 'if (Math.abs(d[k] - v) > 6e-3) changed = true; };');\nfs.writeFileSync('index.html',s);\nconsole.log('ok');\n\" 2>&1 | head -2; node .t/t_interact.js 2>&1 | grep -v \"^ok\" | head -5; node .t/simlab.js '{}' '{\"T\":400}' 2>&1 | head -3",
  "description": "Scale cohesion by warmth; relax change threshold; re-test",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_018Sm9no2iuUwzp8HeZjKyWg-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_018Sm9no2iuUwzp8HeZjKyWg","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"04ef311d-03fc-4d02-86e4-e3fc70bb9175"}

[system]
task_notification

[tool error]
Exit code 1
ok
all interaction tests passed
components 4.48  merges/min 24.4  splits/min 24.4  moving 85%  y-hist(10u bins) 19,13,13,13,13,14,15  nan false
y range per blob: 4-67 3-67 3-68 3-68 2-69 2-68 3-66 3-66 2-67
zsh:9: operation not permitted: [redacted:local-path]

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[thinking]
All interaction tests pass, covering idle detection, wake-up, mid-run resizes, and WebGL context loss/restore/fallback. Now I'll examine the switch closely in its off, on, and mid-flip states.

[tool Write]
{
  "file_path": "[workspace]/.t/t_switch.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nconst { stitch } = require('./sheet.js');\nconst page = createPage({ vw: 390, vh: 844, dpr: 3 });\nconst crop = { x: 120, y: 740, w: 150, h: 70 };\nconst imgs = [];\npage.frames(30);\nimgs.push(page.shot('tmp.png', 3, crop));             // on\npage.click(); page.frames(2);\nimgs.push(page.shot('tmp.png', 3, crop));             // mid-flip\npage.frames(30);\nimgs.push(page.shot('tmp.png', 3, crop));             // off\npage.click(); page.frames(3);\nimgs.push(page.shot('tmp.png', 3, crop));             // flipping back\npage.frames(30);\nimgs.push(page.shot('tmp.png', 3, crop));             // on again\nstitch(imgs, 'switch.png');\nconsole.log('ok');\n"
}

[tool result]
File created successfully at: [workspace]/.t/t_switch.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/t_switch.js 2>&1 | head -3",
  "description": "Render switch states close up",
  "timeout": 300000
}

[tool error]
Exit code 1
ok
zsh:1: operation not permitted: [redacted:local-path]

[system]
status

[tool Read]
{
  "file_path": "[workspace]/.t/out/switch.png"
}

[tool result]
[image]

[user]
[Image: original 2250x210, displayed at 2000x187. Multiply coordinates by 1.13 to map to original image.]

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[thinking]
The switch animation checks out across all states. I'll now cap the GPU wax canvas at 3× on phones, add a pixel budget to the static background canvas to avoid blowing memory on large hi-DPI windows, and add a header documenting the script's URL options.

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet s=fs.readFileSync('index.html','utf8');\nconst rep=(a,b)=>{ if(!s.includes(a)) throw new Error('missing: '+a.slice(0,70)); s=s.replace(a,b); };\nrep(\\\"  const dpr = Math.min(win.devicePixelRatio || 1, 2) * waxQual;\\n  const st = waxC.style, u = L.u;\\\", \\\"  const dpr = Math.min(win.devicePixelRatio || 1, wax.kind === 'gl' ? 3 : 2) * waxQual;\\n  const st = waxC.style, u = L.u;\\\");\nrep(\\\"  drawBackground(place(bgC, e.x0, e.y0, e.x1, e.y1, Math.min(dpr, 2)), e);\\\", \\\"  const bgDpr = Math.min(dpr, 2, Math.sqrt(6e6 / (L.vw * L.vh)));      // keep the full-screen canvas under ~6 megapixels\\n  drawBackground(place(bgC, e.x0, e.y0, e.x1, e.y1, bgDpr), e);\\\");\nrep(\\\"
1146	
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1148

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[thinking]
Lamp is built and thoroughly tested via a Node-based simulation rig (since a real browser isn't available here), covering simulation, rendering fallbacks, layout, and performance. I found two minor issues—an old Safari focus ring and a zero-size-viewport edge case—and I'm fixing those now before re-running everything and cleaning up.

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet s=fs.readFileSync('index.html','utf8');\nconst rep=(a,b)=>{ if(!s.includes(a)) throw new Error('missing: '+a.slice(0,70)); s=s.replace(a,b); };\n// focus ring that also works where :focus-visible is unsupported\nrep('#sw:focus { outline: none; }\\n#sw:focus-visible { outline: 2px solid #ffd9a8; outline-offset: 3px; }', '#sw:focus { outline: 2px solid #ffd9a8; outline-offset: 3px; }\\n#sw:focus:not(:focus-visible) { outline: none; }');\n// renderers report when they have been sized, so a zero-size viewport cannot break the first paint\nrep(\\\"      cw = canvas.width = w; ch = canvas.height = h;\\n      const cs = self.cellPx / L.u;\\\", \\\"      cw = canvas.width = w; ch = canvas.height = h; self.ready = true;\\n      const cs = self.cellPx / L.u;\\\");\nrep(\\\"kind: 'cpu', cellPx: 2.2, minCell: 1.5, maxCell: 3.8, skip: 1, ms: 0,\\\", \\\"kind: 'cpu', ready: false, cellPx: 2.2, minCell: 1.5, maxCell: 3.8, skip: 1, ms: 0,\\\");\nrep(\\\"kind: 'gl', gl, w: 1, h: 1, checked: false,\\n      resize(w, h) { self.w = canvas.width = w; self.h = canvas.height = h; gl.viewport(0, 0, w, h); },\\\", \\\"kind: 'gl', ready: false, gl, w: 1, h: 1, checked: false,\\n      resize(w, h) { self.w = canvas.width = w; self.h = canvas.height = h; self.ready = true; gl.viewport(0, 0, w, h); },\\\");\nrep('function drawWax() {\\n  if (!wax) return;', 'function drawWax() {\\n  if (!wax || !wax.ready) return;');\nfs.writeFileSync('index.html',s);\nconsole.log('ok');\n\" 2>&1 | head -2",
  "description": "Apply focus-ring and zero-size-viewport fixes"
}

[tool error]
Exit code 1
ok
zsh:14: operation not permitted: [redacted:local-path]

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[assistant]
Now tests for those two cases (zero-size viewport at load, and the reduced-motion preference), then a full re-run of every suite:

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet h=fs.readFileSync('.t/harness.js','utf8');\nif(!h.includes('o.reduced')) {\n  h=h.replace(\\\"getComputedStyle: () => ({ paddingBottom: (o.safeBottom || 0) + 'px' }),\\\", \\\"getComputedStyle: () => ({ paddingBottom: (o.safeBottom || 0) + 'px' }),\\\\n    matchMedia: o.reduced ? () => ({ matches: true }) : undefined,\\\");\n  fs.writeFileSync('.t/harness.js',h);\n}\nlet t=fs.readFileSync('.t/t_interact.js','utf8');\nif(!t.includes('zero-size')) {\n  t=t.replace(\\\"console.log(bad ? \\`\\${bad} FAILED\\` : 'all interaction tests passed');\\\", \\`// ---- edge cases: a zero-size viewport at load (hidden iframe), and the reduced-motion preference\n{\n  const page = createPage({ vw: 0, vh: 0, dpr: 2 });\n  const A = page.win.__lava;\n  page.frames(5);\n  ok('zero-size viewport at load: no crash, frame loop alive', typeof page.raf === 'function');\n  page.resize(390, 844, 2); page.frames(2);\n  ok('zero-size viewport: draws once it gets a size', nonEmpty(page.els.room.children[2]) > 500 && A.layout.u > 3);\n  const normal = createPage({ vw: 390, vh: 844, dpr: 1 }), calm = createPage({ vw: 390, vh: 844, dpr: 1, reduced: true });\n  const n0 = normal.win.__lava.sim.time, c0 = calm.win.__lava.sim.time;\n  normal.frames(120); calm.frames(120);\n  const dn = normal.win.__lava.sim.time - n0, dc = calm.win.__lava.sim.time - c0;\n  ok('prefers-reduced-motion halves the wax speed', Math.abs(dc / dn - 0.5) < 0.02, dn.toFixed(2) + 's vs ' + dc.toFixed(2) + 's');\n}\nconsole.log(bad ? \\\\\\`\\\\\\${bad} FAILED\\\\\\` : 'all interaction tests passed');\\`);\n  fs.writeFileSync('.t/t_interact.js',t);\n}\nconsole.log('prepared');\n\" 2>&1 | head -3; node .t/t_interact.js 2>&1 | grep -v \"^ok   resize\\|^ok   click\\|^ok   light\" | head -30",
  "description": "Add edge-case tests and run interaction suite",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_012LmQ2F1uvRiGz4LYjd2Zqy-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_012LmQ2F1uvRiGz4LYjd2Zqy","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"b38974f1-a2d1-4566-8e8e-90f7cf21aa5f"}

[system]
task_notification

[tool error]
Exit code 1
prepared
ok   starts on 
ok   rapid toggling stays consistent 
ok   settled, switched-off lamp stops redrawing the wax 0 draws in 60 frames
ok   switching on wakes it up and redraws every frame 30 draws in 30 frames
ok   5 s frame gap is clamped 
ok   sim stays finite and inside the glass 
ok   gl: starts on the GPU path 
ok   gl: context loss is handled (preventDefault, renderer dropped) 
ok   gl: context restore brings the GPU renderer back and draws 
ok   gl: a lost context schedules a fallback 
ok   gl: falls back to the CPU renderer on a fresh canvas 
ok   zero-size viewport at load: no crash, frame loop alive 
ok   zero-size viewport: draws once it gets a size 
ok   prefers-reduced-motion halves the wax speed 2.00s vs 1.00s
all interaction tests passed
zsh:28: operation not permitted: [redacted:local-path]

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[thinking]
All tests pass: no draws while settled/off, wake-up draws every frame, zero-size viewport handled gracefully, and reduced-motion runs at exactly half speed. Now running the full regression suite across all tests after these edits.

[tool Bash]
{
  "command": "echo \"== glsl interpreter self-test\"; node .t/glsl_selftest.js 2>&1 | tail -1; echo \"== shader parity\"; node .t/glsl_check.js 96 0,13,40 1,0.5,0 2>&1 | tail -11; echo \"== render paths\"; node .t/t_gl.js 2>&1 | tail -1",
  "description": "Regression: GLSL validation, parity and render paths",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01VwprLJa4hJBMLXfQpZXTYf-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01VwprLJa4hJBMLXfQpZXTYf","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"875a4084-a922-43e5-951d-ab8c999f85ac"}

[system]
task_notification

[tool error]
Exit code 1
== glsl interpreter self-test
all interpreter self-tests passed
== shader parity
vertex shader type-checks
t=0s light=1: 96x153 px in 120 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.3,73.3 | NaN 0 | wax px 1541
t=0s light=0.5: 96x153 px in 124 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.3,73.3 | NaN 0 | wax px 1541
t=0s light=0: 96x153 px in 115 ms | mean |diff| 0.00000 | max |diff| 0.0001 at -8.3,73.3 | NaN 0 | wax px 1541
t=13s light=1: 96x153 px in 114 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.3,73.3 | NaN 0 | wax px 1724
t=13s light=0.5: 96x153 px in 120 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.3,73.3 | NaN 0 | wax px 1724
t=13s light=0: 96x153 px in 122 ms | mean |diff| 0.00000 | max |diff| 0.0001 at -8.3,73.3 | NaN 0 | wax px 1724
t=40s light=1: 96x153 px in 112 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.3,73.3 | NaN 0 | wax px 1736
t=40s light=0.5: 96x153 px in 118 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.3,73.3 | NaN 0 | wax px 1736
t=40s light=0: 96x153 px in 111 ms | mean |diff| 0.00000 | max |diff| 0.0001 at -8.3,73.3 | NaN 0 | wax px 1736
GLSL output matches the JS reference
== render paths
all render-path tests passed
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
All tests pass. Now I'll run a long soak test simulating 30 minutes with random power toggling, checking for non-finite values, blobs staying within bounds, and the lamp avoiding a static state while powered.

[tool Write]
{
  "file_path": "[workspace]/.t/soak.js",
  "content": "'use strict';\n// 30 simulated minutes with random power toggling at several frame rates: stability, containment, liveliness.\nconst { build } = require('./simlab.js');\nconst GH = 72;\nlet bad = 0;\nconst ok = (name, cond, extra) => { if (!cond) { bad++; console.log('FAIL', name, extra || ''); } else console.log('ok  ', name, extra || ''); };\n\nfunction glassHW(y) { y = Math.max(y, 0); return 8.6 + 16.4 * Math.pow(Math.max(1 - y / GH, 0), 1.3) - 5.2 * Math.exp(-y / 5); }\n\nfor (const fps of [30, 60, 144]) {\n  const { sim, N } = build({});\n  sim.warm(70);\n  const dt = 1 / fps;\n  let seed = 12345; const rnd = () => (seed = (seed * 1664525 + 1013904223) >>> 0) / 4294967296;\n  let nextToggle = 60 + rnd() * 120, onTime = 0, movingOn = 0, samplesOn = 0, finite = true, inside = true, worstOut = 0;\n  let maxHeight = 0, deadWhileOn = 0;\n  for (let k = 0, T = 30 * 60 * fps; k < T; k++) {\n    const t = k * dt;\n    if (t > nextToggle) { sim.power = sim.power ? 0 : 1; nextToggle = t + 30 + rnd() * 150; }\n    const n = Math.max(1, Math.ceil(dt * 90));\n    for (let i = 0; i < n; i++) sim.step(dt / n);\n    if (k % fps === 0) {\n      for (let i = 0; i < N; i++) {\n        if (!isFinite(sim.x[i] + sim.y[i] + sim.T[i] + sim.vx[i] + sim.vy[i] + sim.st[i])) finite = false;\n        const lim = glassHW(Math.min(sim.y[i] + 0.5 * sim.r[i], GH)) - 0.88 * sim.r[i] + 1e-6;\n        const out = Math.max(Math.abs(sim.x[i]) - Math.max(lim, 0), 0, 0.62 * sim.r[i] - sim.y[i] - 1e-6, sim.y[i] - (GH - 0.85 * sim.r[i]) - 1e-6);\n        worstOut = Math.max(worstOut, out);\n        if (out > 1e-3) inside = false;\n        maxHeight = Math.max(maxHeight, sim.y[i]);\n      }\n      if (sim.power && sim.heater > 0.95) {\n        samplesOn++;\n        let mv = 0; for (let i = 0; i < N; i++) if (Math.abs(sim.vy[i]) > 0.8) mv++;\n        movingOn += mv;\n        if (mv === 0) deadWhileOn++;\n      }\n    }\n  }\n  ok(`${fps} fps: state stays finite for 30 min`, finite);\n  ok(`${fps} fps: blobs stay inside the glass`, inside, 'worst overshoot ' + worstOut.toFixed(4));\n  ok(`${fps} fps: lamp stays lively while on`, samplesOn > 100 && movingOn / samplesOn > 2.5 && deadWhileOn / samplesOn < 0.03, `${(movingOn / samplesOn).toFixed(1)} blobs moving on average, ${deadWhileOn}/${samplesOn} dead samples`);\n  ok(`${fps} fps: blobs reach the top of the glass`, maxHeight > GH - 8, 'max y ' + maxHeight.toFixed(1));\n}\nconsole.log(bad ? `${bad} FAILED` : 'soak tests passed');\nprocess.exitCode = bad ? 1 : 0;\n"
}

[tool result]
File created successfully at: [workspace]/.t/soak.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/soak.js 2>&1 | head -20",
  "description": "Long-run soak test of the wax simulation",
  "timeout": 900000
}

[tool error]
Exit code 1
ok   30 fps: state stays finite for 30 min 
ok   30 fps: blobs stay inside the glass worst overshoot 0.0000
ok   30 fps: lamp stays lively while on 7.9 blobs moving on average, 1/973 dead samples
ok   30 fps: blobs reach the top of the glass max y 69.5
ok   60 fps: state stays finite for 30 min 
ok   60 fps: blobs stay inside the glass worst overshoot 0.0000
ok   60 fps: lamp stays lively while on 7.9 blobs moving on average, 1/973 dead samples
ok   60 fps: blobs reach the top of the glass max y 69.6
ok   144 fps: state stays finite for 30 min 
ok   144 fps: blobs stay inside the glass worst overshoot 0.0000
ok   144 fps: lamp stays lively while on 7.9 blobs moving on average, 0/973 dead samples
ok   144 fps: blobs reach the top of the glass max y 69.5
soak tests passed
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
Soak tests passed at 30, 60, and 144 fps — stable over 30 minutes, blobs stayed contained, and about 8 of 9 remained active on average. Now I'll check the first-paint state to see what visitors see on load.

[tool Bash]
{
  "command": "node .t/t2.js 390 844 3 0 first_paint.png 1 2>&1 | head -2",
  "description": "Render the page exactly at first paint",
  "timeout": 300000
}

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task_started

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[tool error]
Exit code 1
shot first_paint.png 390x844 dpr 3 render ms 44 layout {"vw":390,"vh":844,"u":3.9,"ox":0,"oy":142,"inset":0}
zsh:1: operation not permitted: [redacted:local-path]

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[tool Read]
{
  "file_path": "[workspace]/.t/out/first_paint.png"
}

[tool result]
[image]

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[thinking]
The first paint works, but I don't see any wax pooled at the bottom at this moment, which hurts the lava-lamp feel. I'll scan through the warm-up period to find a frame where the pool, mid-height blobs, and high blobs are all visible together.

[tool Write]
{
  "file_path": "[workspace]/.t/pick_warm.js",
  "content": "'use strict';\n// Scan startup warm-up lengths for a pleasing first frame: some wax pooled, some mid-glass, some high, mostly separate blobs.\nconst { build } = require('./simlab.js');\nconst out = [];\nfor (let warm = 50; warm <= 110; warm++) {\n  const { sim, N, K, TH } = build({});\n  // the page warms in 1/30 s steps; reproduce that exactly, but stop at `warm` seconds\n  for (let t = 0; t < warm; t += 1 / 30) sim.step(1 / 30);\n  let low = 0, mid = 0, high = 0;\n  for (let i = 0; i < N; i++) { if (sim.y[i] < 10) low++; else if (sim.y[i] > 42) high++; else mid++; }\n  // count visually separate masses\n  const GX = 0.8, gw = 60, gh = 92, grid = new Uint8Array(gw * gh);\n  for (let j = 0; j < gh; j++) for (let i = 0; i < gw; i++) {\n    const x = -24 + (i + 0.5) * GX, y = 70.6 - (j + 0.5) * GX; let f = 0;\n    for (let k = 0; k < N; k++) { const s = sim.st[k], dx = x - sim.x[k], dy = y - sim.y[k], R = K * sim.r[k], q = (dx * dx * s + dy * dy / s) / (R * R); if (q < 1) { const m = 1 - q; f += m * m * m; } }\n    grid[j * gw + i] = f > TH ? 1 : 0;\n  }\n  const seen = new Uint8Array(gw * gh); let comps = 0; const st = [];\n  for (let s0 = 0; s0 < grid.length; s0++) {\n    if (!grid[s0] || seen[s0]) continue; comps++; st.push(s0); seen[s0] = 1;\n    while (st.length) { const p = st.pop(), i = p % gw, j = (p / gw) | 0; for (const [di, dj] of [[1, 0], [-1, 0], [0, 1], [0, -1]]) { const ni = i + di, nj = j + dj; if (ni < 0 || nj < 0 || ni >= gw || nj >= gh) continue; const q = nj * gw + ni; if (grid[q] && !seen[q]) { seen[q] = 1; st.push(q); } } }\n  }\n  const score = Math.min(low, 2) * 2 + Math.min(mid, 3) + Math.min(high, 2) * 1.5 + Math.min(comps, 6);\n  out.push({ warm, low, mid, high, comps, score });\n}\nout.sort((a, b) => b.score - a.score);\nconsole.log(out.slice(0, 8).map(o => `warm ${o.warm}s: pool ${o.low} mid ${o.mid} high ${o.high} masses ${o.comps} score ${o.score}`).join('\\n'));\n"
}

[tool result]
File created successfully at: [workspace]/.t/pick_warm.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/pick_warm.js 2>&1 | head -12",
  "description": "Scan warm-up durations for a pleasing first frame",
  "timeout": 300000
}

[tool error]
Exit code 1
warm 72s: pool 2 mid 3 high 4 masses 6 score 16
warm 57s: pool 2 mid 3 high 4 masses 5 score 15
warm 69s: pool 2 mid 3 high 4 masses 5 score 15
warm 70s: pool 2 mid 3 high 4 masses 5 score 15
warm 71s: pool 2 mid 3 high 4 masses 5 score 15
warm 73s: pool 2 mid 3 high 4 masses 5 score 15
warm 58s: pool 2 mid 3 high 4 masses 4 score 14
warm 60s: pool 2 mid 2 high 5 masses 5 score 14
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
The scan expects two blobs in the pool at 70s warm-up, but the first-paint screenshot shows none — I'll dig into this inconsistency by comparing the page's actual state against the scan.

[tool Write]
{
  "file_path": "[workspace]/.t/cmp_state.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nconst { build } = require('./simlab.js');\nconst page = createPage({ vw: 390, vh: 844, dpr: 1 });\nconst A = page.win.__lava;\nconsole.log('page y   :', Array.from(A.sim.y).map(v => v.toFixed(1)).join(' '));\nconsole.log('page x   :', Array.from(A.sim.x).map(v => v.toFixed(1)).join(' '));\nconsole.log('page time:', A.sim.time.toFixed(2));\nconst { sim } = build({});\nsim.warm(70);\nconsole.log('lab  y   :', Array.from(sim.y).map(v => v.toFixed(1)).join(' '));\nconsole.log('lab  time:', sim.time.toFixed(2));\nconsole.log('radii    :', Array.from(sim.r).join(' '));\n"
}

[tool result]
File created successfully at: [workspace]/.t/cmp_state.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/cmp_state.js 2>&1 | head",
  "description": "Compare page sim state with the lab's",
  "timeout": 120000
}

[tool error]
Exit code 1
page y   : 13.5 16.5 3.1 7.9 47.4 59.0 47.8 36.3 55.4
page x   : -10.0 2.5 -5.4 -8.9 2.9 3.0 6.7 -1.9 -5.6
page time: 70.03
lab  y   : 13.5 16.5 3.1 7.9 47.4 59.0 47.8 36.3 55.4
lab  time: 70.03
radii    : 6.3 5.5 4.9 4.4 4 3.6 3.2 2.8 2.5
zsh:1: operation not permitted: [redacted:local-path]

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[assistant]
The states are identical, so two blobs really are low (heights 3.1 and 7.9), and the screenshot should show them. I'll zoom into the bottom of the glass at first paint:

[tool Bash]
{
  "command": "node .t/crop.js 390 844 3 0 fp_bottom.png 95 540 200 90 5 2>&1 | head -2",
  "description": "Zoom on the bottom of the glass at first paint",
  "timeout": 300000
}

[tool error]
Exit code 1
wrote fp_bottom.png
zsh:1: operation not permitted: [redacted:local-path]

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status

[tool Read]
{
  "file_path": "[workspace]/.t/out/fp_bottom.png"
}

[tool result]
[image]

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[thinking]
The zoomed view confirms a merged wax pool already formed, so I'll keep the 70s warm-up, and I'll widen the anti-aliasing band on the CPU fallback path to smooth the stair-stepped edges from the coarse grid.

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/index.html",
  "old_string": "          waxOver(f, GX[o], GY[o], TW[o], WX0 + (i + 0.5) * csx, y, pxu, light, q, px);",
  "new_string": "          waxOver(f, GX[o], GY[o], TW[o], WX0 + (i + 0.5) * csx, y, pxu * 1.5, light, q, px);   // a wider edge band hides the grid"
}

[tool result]
The file [workspace]/index.html has been updated successfully. (note: the file had been modified on disk since you last read it — the edit applied cleanly, but the file contains other changes not in your context. Read it before edits that depend on surrounding content.)

[tool Bash]
{
  "command": "node .t/crop.js 390 844 3 0 fp_bottom2.png 95 540 200 90 5 2>&1 | head -2",
  "description": "Re-render zoom with wider anti-aliasing band",
  "timeout": 300000
}

[tool error]
Exit code 1
wrote fp_bottom2.png
zsh:1: operation not permitted: [redacted:local-path]

[system]
status

[tool Read]
{
  "file_path": "[workspace]/.t/out/fp_bottom2.png"
}

[tool result]
[image]

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[assistant]
The wider band barely helps, so the teeth aren't just under-sampled AA. I'll test whether the edge artifact is fundamental to the coarse grid by rendering the same frame with a much finer grid:

[tool Write]
{
  "file_path": "[workspace]/.t/edge_test.js",
  "content": "'use strict';\nconst { createPage } = require('./harness.js');\nconst { stitch } = require('./sheet.js');\nconst page = createPage({ vw: 390, vh: 844, dpr: 3 });\nconst A = page.win.__lava, wax = A.wax, cv = page.els.room.children[2];\nconst crop = { x: 100, y: 560, w: 110, h: 60 };\nconst imgs = [];\nfor (const cell of [2.2, 1.5, 1.0, 0.6]) {\n  wax.cellPx = cell; wax.resize(cv.width, cv.height);\n  wax.draw(A.ub, A.us, 1);\n  imgs.push(page.shot('tmp.png', 5, crop));\n  console.log('cell', cell, 'grid', Math.round(48 / (cell / A.layout.u)), 'x', Math.round(75.6 / (cell / A.layout.u)));\n}\nstitch(imgs, 'edge_test.png');\n"
}

[tool result]
File created successfully at: [workspace]/.t/edge_test.js (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/edge_test.js 2>&1 | head -6",
  "description": "Compare edge quality at several grid resolutions",
  "timeout": 300000
}

[tool error]
Exit code 1
cell 2.2 grid 85 x 134
cell 1.5 grid 125 x 197
cell 1 grid 187 x 295
cell 0.6 grid 312 x 491
zsh:1: operation not permitted: [redacted:local-path]

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[tool Read]
{
  "file_path": "[workspace]/.t/out/edge_test.png"
}

[tool result]
[image]

[user]
[Image: original 2200x300, displayed at 2000x273. Multiply coordinates by 1.10 to map to original image.]

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[thinking]
I've confirmed the stair-stepping is just a resolution artifact that the adaptive grid already handles, so I'll revert the unnecessary wider band to match the reference shader exactly. Next I'll hoist `packBlobs` out of the per-frame loop to avoid allocations, and add clearer I/O power marks to the switch.

[tool Bash]
{
  "command": "node -e \"\nconst fs=require('fs');\nlet s=fs.readFileSync('index.html','utf8');\nconst rep=(a,b)=>{ if(!s.includes(a)) throw new Error('missing: '+a.slice(0,70)); s=s.replace(a,b); };\nrep('waxOver(f, GX[o], GY[o], TW[o], WX0 + (i + 0.5) * csx, y, pxu * 1.5, light, q, px);   // a wider edge band hides the grid', 'waxOver(f, GX[o], GY[o], TW[o], WX0 + (i + 0.5) * csx, y, pxu, light, q, px);');\n// hoist the per-frame closure out of packBlobs\nrep(\\\"function packBlobs() {                                  // sim state -> renderer inputs; true if the picture would visibly change\\n  const { x, y, r, T, st, ph, time, heater } = sim;\\n  const wob = 0.03 * heater;                            // warm wax quivers a little; cold wax is still\\n  let changed = false;\\n  const put = (a, d, k, v) => { a[k] = v; if (Math.abs(d[k] - v) > 6e-3) changed = true; };   // slow drift adds up; solver jitter never shows\\n  for (let i = 0; i < N; i++) {\\\", \\\"let moved = false;\\nfunction put(a, drawn, k, v) {                           // slow drift adds up against what was last drawn; solver jitter never shows\\n  a[k] = v;\\n  if (Math.abs(drawn[k] - v) > 6e-3) moved = true;\\n}\\n\\nfunction packBlobs() {                                  // sim state -> renderer inputs; true if the picture would visibly change\\n  const { x, y, r, T, st, ph, time, heater } = sim;\\n  const wob = 0.03 * heater;                            // warm wax quivers a little; cold wax is still\\n  moved = false;\\n  for (let i = 0; i < N; i++) {\\\");\nrep('    put(us, usDrawn, i, st[i]);\\n  }\\n  return changed;\\n}', '    put(us, usDrawn, i, st[i]);\\n  }\\n  return moved;\\n}');\n// I/O marks on the switch\nrep(\\\"  rr(c, tx, ty, tw, th, th / 2);\\n  c.strokeStyle = 'rgba(0,0,0,0.6)'; c.lineWidth = 0.35; c.stroke();\\n  const kr\\\", \\\"  rr(c, tx, ty, tw, th, th / 2);\\n  c.strokeStyle = 'rgba(0,0,0,0.6)'; c.lineWidth = 0.35; c.stroke();\\n  const my = ty + th / 2;                                // the power marks show at whichever end the knob has left\\n  c.lineWidth = 0.4; c.lineCap = 'round';\\n  c.strokeStyle = \\`rgba(215,220,235,\\${0.8 * p})\\`; c.beginPath(); c.arc(tx + th / 2, my, 1.05, 0, TAU); c.stroke();\\n  c.strokeStyle = \\`rgba(255,238,205,\\${0.9 * (1 - p)})\\`; c.beginPath(); c.moveTo(tx + tw - th / 2, my - 1.2); c.lineTo(tx + tw - th / 2, my + 1.2); c.stroke();\\n  const kr\\\");\nfs.writeFileSync('index.html',s);\nconsole.log('ok');\n\" 2>&1 | head -2; node .t/t_switch.js 2>&1 | head -2",
  "description": "Revert AA tweak, hoist closure, add I/O marks; render switch",
  "timeout": 300000
}

[tool error]
Exit code 1
ok
ok
zsh:13: operation not permitted: [redacted:local-path]

[system]
status

[system]
thinking_tokens

[system]
thinking_tokens

[tool Edit]
{
  "replace_all": false,
  "file_path": "[workspace]/.t/t_switch.js",
  "old_string": "const crop = { x: 120, y: 740, w: 150, h: 70 };",
  "new_string": "const crop = { x: 140, y: 740, w: 110, h: 64 };"
}

[tool result]
The file [workspace]/.t/t_switch.js has been updated successfully. (file state is current in your context — no need to Read it back)

[tool Bash]
{
  "command": "node .t/t_switch.js 2>&1 | head -2",
  "description": "Re-render switch states with the new marks",
  "timeout": 300000
}

[tool error]
Exit code 1
ok
zsh:1: operation not permitted: [redacted:local-path]

[system]
status

[tool Read]
{
  "file_path": "[workspace]/.t/out/switch.png"
}

[tool result]
[image]

[system]
status

[system]
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[system]
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[system]
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[assistant]
The marks work: an "O" at the exposed left end when on, an "I" at the exposed right end when off, and both faded mid-flip. Next the complete regression after these final edits:

[tool Bash]
{
  "command": "echo \"== shader parity\"; node .t/glsl_check.js 80 0,20 1,0.3 2>&1 | tail -6; echo \"== render paths\"; node .t/t_gl.js 2>&1 | tail -1; echo \"== interaction\"; node .t/t_interact.js 2>&1 | grep -c \"^ok\"; node .t/t_interact.js 2>&1 | grep -v \"^ok\" | head -5",
  "description": "Regression: parity, render paths, interaction",
  "timeout": 900000
}

[tool Bash]
{
  "command": "echo \"== soak\"; node .t/soak.js 2>&1 | tail -2; echo \"== adapt\"; node .t/t_adapt.js 2>&1 | grep -E \"device|30s\"; echo \"== viewports\"; node .t/t_viewports.js 2>&1 | head -10",
  "description": "Regression: soak, adaptivity, viewports",
  "timeout": 900000
}

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01Wad7ggf6uU1z1Udk62L4Wp-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01Wad7ggf6uU1z1Udk62L4Wp","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"e2a06041-3e0a-4abc-8e17-3daf08748d86"}

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01Wad7ggf6uU1z1Udk62L4Wp-heartbeat-1","tool_name":"Bash","parent_tool_use_id":"toolu_01Wad7ggf6uU1z1Udk62L4Wp","elapsed_time_seconds":60,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"33b73ff0-9049-499b-85de-f70608ce8877"}

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01Wad7ggf6uU1z1Udk62L4Wp-heartbeat-2","tool_name":"Bash","parent_tool_use_id":"toolu_01Wad7ggf6uU1z1Udk62L4Wp","elapsed_time_seconds":90,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"6a601920-da53-4d77-91af-1f419910fc98"}

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01Wad7ggf6uU1z1Udk62L4Wp-heartbeat-3","tool_name":"Bash","parent_tool_use_id":"toolu_01Wad7ggf6uU1z1Udk62L4Wp","elapsed_time_seconds":120,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"2459bca3-682e-41e3-89ef-946b88ba06e8"}

[system]
task_notification

[tool error]
Exit code 1
== shader parity
vertex shader type-checks
t=0s light=1: 80x128 px in 93 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.1,72.7 | NaN 0 | wax px 1069
t=0s light=0.3: 80x128 px in 89 ms | mean |diff| 0.00000 | max |diff| 0.0001 at -8.1,72.7 | NaN 0 | wax px 1069
t=20s light=1: 80x128 px in 93 ms | mean |diff| 0.00000 | max |diff| 0.0002 at -8.1,72.7 | NaN 0 | wax px 996
t=20s light=0.3: 80x128 px in 81 ms | mean |diff| 0.00000 | max |diff| 0.0001 at -8.1,72.7 | NaN 0 | wax px 996
GLSL output matches the JS reference
== render paths
all render-path tests passed
== interaction
28
all interaction tests passed
zsh:1: operation not permitted: [redacted:local-path]

[system]
task_started

[tool_progress]
{"type":"tool_progress","tool_use_id":"toolu_01DBpmBZfGnwZZNtUDDpPw6z-heartbeat-0","tool_name":"Bash","parent_tool_use_id":"toolu_01DBpmBZfGnwZZNtUDDpPw6z","elapsed_time_seconds":30,"heartbeat":true,"session_id":"862aec6b-9529-44ae-a902-cbafbd1ecd54","uuid":"7eee0f9b-d285-4f4a-b295-50471564709c"}

[system]
task_notification

[tool error]
Exit code 1
== soak
ok   144 fps: blobs reach the top of the glass max y 69.5
soak tests passed
== adapt
device 1x slower:
  30s: cell 1.50 skip 1 ms 2.8
device 4x slower:
  30s: cell 2.60 skip 1 ms 3.8
device 8x slower:
  30s: cell 3.30 skip 1 ms 4.7
device 16x slower:
  30s: cell 3.80 skip 3 ms 7.1
== viewports
se        320x568 dpr2 safe0: u=3.16 stage 316x568 @ (2,0) | switch 68x36 at (126,515) inside viewport | tap target 92x60
android   360x740 dpr2 safe0: u=3.60 stage 360x648 @ (0,92) | switch 76x40 at (142,680) inside viewport | tap target 100x64
pixel     412x915 dpr2 safe0: u=4.12 stage 412x742 @ (0,173) | switch 87x45 at (163,846) inside viewport | tap target 111x69
promax    430x932 dpr2 safe0: u=4.30 stage 430x774 @ (0,158) | switch 90x47 at (170,860) inside viewport | tap target 114x71
notch     390x844 dpr2 safe34: u=3.90 stage 390x702 @ (0,114) | switch 82x43 at (154,751) inside viewport | tap target 106x67
landscape 844x390 dpr2 safe0: u=2.17 stage 217x390 @ (314,0) | switch 68x36 at (388,342) inside viewport | tap target 92x60
tablet    768x1024 dpr1 safe0: u=5.69 stage 569x1024 @ (100,0) | switch 119x63 at (324,929) inside viewport | tap target 143x87
desktop   1440x900 dpr1 safe0: u=5.00 stage 500x900 @ (470,0) | switch 105x55 at (668,817) inside viewport | tap target 129x79
zsh:1: operation not permitted: [redacted:local-path]

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[thinking]
All suites pass, including shader parity, render paths, interaction checks, the soak test, adaptivity, and viewport sizing with proper tap targets. Now I'll run a static scan of the deliverable to catch anything that could trigger a network request.

[tool Bash]
{
  "command": "echo \"--- patterns that could cause a request (expect none):\"; grep -n -i -E \"http|url\\(|@import|@font-face|fetch\\(|XMLHttpRequest|import\\(|new Image|WebSocket|sendBeacon|/