Refactoring: one file per node, consistent comments, shared helpers, split large modules

- Graph: nodes.ts split into nodes/<category>/<Type>.ts (62 files) with
  shared.ts factories and index.ts registry; NodeContext/values/NodeRegistry
  separated, writeTyped() replaces duplicated typed writes
- Comments: one style (JSDoc on non-obvious exports, // for decisions and
  traps), wrong/stale comments fixed or removed, ids.ts now real 10 base-36 chars
- Core: chainOf, shared worldPosition/editorPosition core, commands/require.ts,
  commands/naming.ts, util/list.ts, setBagValue/toPosition/propDef; dead code
  removed (isBehaviorAsset, SCENE_OBJECT_SCHEMA, CommandStack.subscribe,
  Input.axis, setMode, titleText, World.worldPosition, unused ctor params)
- Editor: Inspector split into inspector/ sections, App.ts into Editor.ts +
  debugHook.ts + shortcuts.ts, Viewport into items.ts + symbols.ts, shared
  "Add collider" action, unified type labels/swatches
- UI toolkit: Widget.trackHover/onPointerRelease, drawControlBox, math helpers,
  Popup.openBelow, Menu/Dialog/ColorPicker/ListRow in own files, named Theme sizes
- Tools: seed-demo/smoke-demo and demo-check project removed, tools/lib
  (harness, projects, builders), e2e.mjs as runner over tools/e2e/*.mjs sections
- Tests: tests/helpers.ts replaces copied fixtures and NodeContext doubles

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

tools/lib/projects.mjs

@@ -0,0 +1,50 @@
+/**
+ * Which project each tool writes to, and the guard that keeps every tool away from the
+ * playground.
+ *
+ *   playground  the user's own project. No tool writes it – it is maintained in the editor.
+ *   fixture     rewritten by every e2e run (tools/seed-e2e.mjs + tools/e2e.mjs).
+ *   jumpRun     the example game (tools/seed-jumprun.mjs, played by tools/smoke-jumprun.mjs).
+ *
+ * All ids exist on the server (created via POST ?r=projects); PUT does not create projects.
+ */
+export const PROJECTS = {
+  playground: '649188c15414',
+  fixture: '3caa9b6a0c92',
+  jumpRun: '3d271f3bb58b',
+};
+
+export const DEFAULT_BASE_URL = 'https://nockal.com/game-maker/';
+
+/**
+ * Reads `[projectId] [baseUrl]` from argv, falling back to `defaultId`. Targeting the playground
+ * aborts: no tool may overwrite or mutate it.
+ */
+export function cliArgs(script, defaultId) {
+  const projectId = process.argv[2] ?? defaultId;
+  const baseUrl = process.argv[3] ?? DEFAULT_BASE_URL;
+  if (projectId === PROJECTS.playground) {
+    console.error(`refusing to run ${script} against the playground project (${PROJECTS.playground}).`);
+    process.exit(2);
+  }
+  return { projectId, baseUrl };
+}
+
+/** Overwrites a project, keeping the name it already has on the server. */
+export async function writeProject(projectId, baseUrl, project) {
+  const url = `${baseUrl}api/index.php?r=projects/${projectId}`;
+  const current = await fetch(url);
+  if (!current.ok) {
+    console.error(`GET failed: ${current.status} – create the project first (POST ?r=projects)`);
+    process.exit(1);
+  }
+  const doc = await current.json();
+  const body = { revision: doc.revision, project: { ...project, id: projectId, name: doc.name ?? project.name } };
+  const res = await fetch(url, { method: 'PUT', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body) });
+  const result = await res.json();
+  if (!res.ok) {
+    console.error('PUT failed', res.status, result);
+    process.exit(1);
+  }
+  console.log(`seeded ${projectId} (${body.project.name}) → revision ${result.revision}`);
+}