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>

tests/core/node-catalog.test.ts

@@ -56,8 +56,6 @@ const pointer = (overrides: Partial<NodeContext['pointer']>): Partial<NodeContex
 });
 
 const CASES: Record<string, Case[]> = {
-  // flow
-
   Branch: [
     { name: 'true takes then', inputs: { condition: true }, next: 'then' },
     { name: 'false takes else', inputs: { condition: false }, next: 'else' },
@@ -104,8 +102,6 @@ const CASES: Record<string, Case[]> = {
     },
   ],
 
-  // variables
-
   // Reading needs the interpreter, which asks `read` at the moment: see variable-node.test.ts.
   Variables: [
     {
@@ -145,8 +141,6 @@ const CASES: Record<string, Case[]> = {
     },
   ],
 
-  // references and properties
-
   Self: [{ name: 'outputs the behavior object', outputs: { object: fakeContext().self } }],
   Owner: [
     { name: 'outputs the object the behavior is parented to', outputs: { object: fakeContext().owner } },
@@ -217,8 +211,6 @@ const CASES: Record<string, Case[]> = {
     },
   ],
 
-  // literals and math
-
   Number: [
     { name: 'outputs its setting', params: { value: 7.5 }, outputs: { value: 7.5 } },
     { name: 'unset is 0', outputs: { value: 0 } },
@@ -290,8 +282,6 @@ const CASES: Record<string, Case[]> = {
     },
   ],
 
-  // text and comparison
-
   ToText: [
     { name: 'formats with decimals', inputs: { value: 12.345, decimals: 1 }, outputs: { text: '12.3' } },
     { name: 'text passes through unformatted', inputs: { value: 'x', decimals: 2 }, outputs: { text: 'x' } },
@@ -318,7 +308,6 @@ const CASES: Record<string, Case[]> = {
       outputs: { text: 'b' },
     },
   ],
-  // lists
 
   List: [
     { name: 'hands out the list it was given', params: { value: [1, 2, 3] }, outputs: { value: [1, 2, 3] } },
@@ -445,8 +434,6 @@ const CASES: Record<string, Case[]> = {
     { name: '"0" as text counts as false', inputs: { value: '0' }, outputs: { result: true } },
   ],
 
-  // vectors and input
-
   Length: [
     { name: '3-4-5 triangle', inputs: { x: 3, y: 4 }, outputs: { result: 5 } },
     { name: 'the zero vector has length 0', inputs: { x: 0, y: 0 }, outputs: { result: 0 } },
@@ -569,8 +556,6 @@ const CASES: Record<string, Case[]> = {
     },
   ],
 
-  // actions
-
   Move: [
     {
       name: 'moves by (dx, dy) × scale × dt',