Refactor round: ship web/index.html, drop the remote browser, fix stale comments and README

- `.gitignore` said `index.html` unanchored, which also caught the Vite source page;
  a fresh clone could neither `dev` nor `build`. Anchored to `/index.html`, page added.
- Removed GM_REMOTE (tools/remote/gm-browser.ps1 and the ssh/scp branch in browser.mjs):
  the Windows test machine is gone and the only flaky check that lived on it is closed (#37).
- Removed `npm run preview`, undocumented and unused.
- Comments: wrong number in collider.test.ts (250 → 200), the "declarations used to…"
  history in listItems.ts and friends, the 24 px/28 contradiction, section banners in
  nodes/index.ts, node-catalog.test.ts and api/index.php, name paraphrases, and the stale
  step numbers in tools/e2e/11-…23- from the old global count.
- README: asset types include `animation`, kind order Number/Text/Boolean, tagged colour
  and texture items, 6/5 kinds, the `Texture` node, `./build.sh`, PROJECT_FORMAT_VERSION,
  and the file tree (kinds.ts, listItems.ts, propertyPorts.ts, Breadcrumb.ts, beads.ts,
  tools/assets/).
- tests/helpers.ts takes the duplicated `findObject` and `sceneWithCamera`.

Proof: ./check.sh 797 tests, full e2e ALL PASSED 633 checks against this bundle.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

tools/lib/browser.mjs

@@ -1,14 +1,4 @@
-/**
- * Launches the check browser locally, or with `GM_REMOTE=user@host` on another machine with the CDP port
- * forwarded over SSH, since this 8 GB host has little memory to spare.
- */
-import { spawn, execFileSync } from 'node:child_process';
-import { fileURLToPath } from 'node:url';
-import { dirname, join } from 'node:path';
-import { homedir } from 'node:os';
-
-const HERE = dirname(fileURLToPath(import.meta.url));
-const LAUNCHER = join(HERE, '..', 'remote', 'gm-browser.ps1');
+import { spawn } from 'node:child_process';
 
 const FLAGS = [
   '--headless',
@@ -29,89 +19,19 @@ const FLAGS = [
   '--mute-audio',
 ];
 
-function sshArgs(key) {
-  return [
-    '-i',
-    key,
-    '-o',
-    'IdentitiesOnly=yes',
-    '-o',
-    'BatchMode=yes',
-    '-o',
-    'StrictHostKeyChecking=accept-new',
-    '-o',
-    'ConnectTimeout=15',
-    // A dead peer must surface as a closed socket, not as a run that waits forever.
-    '-o',
-    'ServerAliveInterval=10',
-    '-o',
-    'ServerAliveCountMax=3',
-  ];
-}
-
-/**
- * Starts the browser and returns its process plus a `stop()` that ends it the way that host
- * needs. `proc.stderr` carries the browser's own last words either way.
- */
+/** Starts chromium with the CDP port open; `proc.stderr` carries its last words. */
 export function launchBrowser({ port, width, height }) {
-  const remote = process.env.GM_REMOTE;
-  if (!remote) {
-    const proc = spawn(
-      'chromium',
-      // --no-sandbox: this container runs as root, where chromium refuses to start otherwise.
-      [
-        ...FLAGS,
-        '--no-sandbox',
-        `--remote-debugging-port=${port}`,
-        `--window-size=${width},${height}`,
-        'about:blank',
-      ],
-      { stdio: ['ignore', 'ignore', 'pipe'] },
-    );
-    return { proc, stop: () => proc.kill('SIGTERM'), where: 'local chromium' };
-  }
-
-  const key = process.env.GM_REMOTE_KEY ?? join(homedir(), '.ssh', 'gm-win.key');
-  // Copied every run so the remote never runs a stale launcher.
-  execFileSync('scp', [...sshArgs(key), LAUNCHER, `${remote}:gm-browser.ps1`], { stdio: 'pipe' });
-
   const proc = spawn(
-    'ssh',
+    'chromium',
+    // --no-sandbox: this container runs as root, where chromium refuses to start otherwise.
     [
-      ...sshArgs(key),
-      '-o',
-      'ExitOnForwardFailure=yes',
-      '-L',
-      `${port}:127.0.0.1:${port}`,
-      remote,
-      `powershell -NoProfile -ExecutionPolicy Bypass -File gm-browser.ps1 -Port ${port} -Size ${width},${height}`,
+      ...FLAGS,
+      '--no-sandbox',
+      `--remote-debugging-port=${port}`,
+      `--window-size=${width},${height}`,
+      'about:blank',
     ],
     { stdio: ['ignore', 'ignore', 'pipe'] },
   );
-
-  return {
-    proc,
-    /**
-     * Ends the browser now rather than after the launcher's idle window. Kill only this pid: the host is
-     * someone's desktop, and killing by name would close their browser.
-     */
-    stop: () => {
-      const pidFile = `$env:TEMP\\gm-browser-${port}.pid`;
-      try {
-        execFileSync(
-          'ssh',
-          [
-            ...sshArgs(key),
-            remote,
-            `powershell -NoProfile -Command "if (Test-Path ${pidFile}) { Stop-Process -Id (Get-Content ${pidFile}) -Force -ErrorAction SilentlyContinue }"`,
-          ],
-          { stdio: 'pipe', timeout: 20_000 },
-        );
-      } catch {
-        // Unreachable host, denied, already gone: the idle window still collects it.
-      }
-      proc.kill('SIGTERM');
-    },
-    where: `remote browser on ${remote}`,
-  };
+  return { proc, stop: () => proc.kill('SIGTERM'), where: 'local chromium' };
 }