Render only when shared state changes

Add shared-data and bundle invalidation signals, and have handles publish them automatically for SAB and graph mutations.

Document the raw core worker protocol in a dedicated VitePress site and simplify the glTF import and picking example.

Amp-Thread-ID: https://ampcode.com/threads/T-01a01ff8-b91f-724f-8952-f07c6b5042fd
Co-authored-by: Heaust Azure <heaust.azure@gmail.com>

package.json

@@ -5,7 +5,9 @@
   "type": "module",
   "workspaces": ["core", "addons/*"],
   "scripts": {
-    "start": "wasm-pack build core --target web --out-dir pkg --release && vitepress dev docs --host 0.0.0.0 --port ${PORT:-8080}"
+    "start": "wasm-pack build core --target web --out-dir pkg --release && vitepress dev docs --host 0.0.0.0 --port ${PORT:-8080}",
+    "coredocs": "vitepress dev coredocs --host 0.0.0.0 --port ${PORT:-8080}",
+    "build:coredocs": "vitepress build coredocs"
   },
   "devDependencies": {
     "@codemirror/lang-javascript": "^6.2.5",