Two invariants weren't captured by the wiki or the review-architecture
skill, so a PR could break them and pass review:
- node-schemas.md documented no backward-compat rule, even though
migrateNodes() runs at load. Add a Schema Evolution section (new
fields need a Zod default; renames/removals/retypes need a
migrateNodes entry) plus a Rules bullet.
- review-architecture skill only checked the narrow host-children
case for migrations and had no editor-layer check at all. Add a
general schema-migration item (§B) and an editor-overlay-layer
item (§E, overlay meshes must set EDITOR_LAYER or they leak into
thumbnails/snapshots and the ink/SSGI buffers).
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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