- Add packages/mcp/ with package.json, tsconfig, PLAN.md, CROSS_CUTTING.md
- Extend @pascal-app/core exports map with subpaths (./schema, ./store,
./material-library, ./spatial-grid, ./wall) so Node consumers can skip
the graphics-bound systems re-export chain.
- Add scripts/spike.ts that proves useScene + temporal work in Node with
a requestAnimationFrame polyfill. Spike passes end-to-end.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>