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>

src/core/model/Project.ts

@@ -1,9 +1,6 @@
 import { type Asset, type ContainerAsset, isSceneAsset, type SceneAsset } from './Asset';
 
-/**
- * 2 since a placed container stopped copying its template into the scene. Old files are not
- * migrated: the loader simply reads no container content from them any more.
- */
+/** 2: a placed container carries no copy of its template. */
 export const PROJECT_FORMAT_VERSION = 2;
 
 export interface Project {

src/core/model/animation.ts

@@ -47,7 +47,6 @@ export function animationFrameAt(asset: AnimationAsset, time: number): FrameAt {
   return frameAt(asset.frames.length, fpsOf(asset), playbackOf(asset), time);
 }
 
-/** Seconds for one pass through the frames. */
 export function animationDuration(asset: AnimationAsset): number {
   const fps = fpsOf(asset);
   return fps > 0 ? asset.frames.length / fps : 0;

src/core/model/texture.ts

@@ -116,7 +116,6 @@ export interface SliceOptions {
   /** Pixels skipped at the left/top edge of the sheet before the first cell. */
   offsetX: number;
   offsetY: number;
-  /** Pixels between neighbouring cells. */
   spacingX: number;
   spacingY: number;
 }