NodeRenderer now checks the registry first. Registered kinds load
their renderer module via React.lazy (cached by RendererSource so the
Suspense boundary is stable across re-renders). Unregistered kinds
fall through to the legacy chain below.
Today the registry is empty (Phase 0 builtinPlugin.nodes is []), so
every node still hits the legacy chain — no behavior change. The
moment a kind registers in @pascal-app/nodes (Phase 2 onward), the
registry path takes over without further edits here.
GLB / instanced-GLB RendererSource kinds are typed but not yet
honored — they get their built-in renderers in Phase 5.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
