Wire loadPlugin(builtinPlugin) at editor app bootstrap

Adds apps/editor/lib/bootstrap.ts that calls loadPlugin(builtinPlugin)
as a module-side-effect on first import. Imported from scene-loader.tsx
so it runs on the client side where the editor mounts.

Idempotency guard handles HMR re-execution (would otherwise throw on
duplicate registerNode). For the empty plugin this commit, the entire
call is a no-op — included now so future commits that add real node
kinds only need to push them onto builtinPlugin.nodes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/editor/components/scene-loader.tsx

@@ -1,5 +1,6 @@
 'use client'
 
+import '../lib/bootstrap'
 import {
   applySceneGraphToEditor,
   Editor,

apps/editor/lib/bootstrap.ts

@@ -0,0 +1,17 @@
+import { loadPlugin } from '@pascal-app/core'
+import { builtinPlugin } from '@pascal-app/nodes'
+
+// Idempotency guard: HMR can reload this module, but `registerNode` throws on
+// duplicate kinds. The flag lives in the module closure so it's reset on a
+// hard reload but survives within a session.
+let loaded = false
+
+export function loadBuiltinNodes(): void {
+  if (loaded) return
+  loaded = true
+  void loadPlugin(builtinPlugin)
+}
+
+// Run as a side effect on first import so any consumer of this module gets a
+// populated registry without remembering to call the function explicitly.
+loadBuiltinNodes()

apps/editor/package.json

@@ -16,6 +16,7 @@
     "@pascal-app/core": "*",
     "@pascal-app/editor": "*",
     "@pascal-app/mcp": "*",
+    "@pascal-app/nodes": "*",
     "@pascal-app/viewer": "*",
     "@radix-ui/react-tooltip": "^1.2.8",
     "@react-three/drei": "^10.7.7",