Adds the floor-plan side of the three-checkbox composition model
documented in wiki/architecture/node-definitions.md. Mirrors the 3D
side (def.geometry → <GeometrySystem> → <ParametricNodeRenderer>) but
emits SVG primitives instead of three.js Object3Ds, and runs inside
the floor-plan panel.
Type-side (packages/core/src/registry/types.ts):
- New FloorplanGeometry tagged union covering path / polygon /
polyline / rect / circle / line / group. FloorplanStyle props map
straight to SVG attributes. Coordinates are level-local meters;
rotations are radians (three.js convention).
- New `def.floorplan?: (node, ctx) => FloorplanGeometry | null` field
on NodeDefinition, independent of `geometry` and `renderer`. Re-
exported via packages/core/src/registry/index.ts.
Runtime (packages/editor):
- <FloorplanGeometryRenderer> walks the FloorplanGeometry tree and
emits the matching React-SVG elements. Pure data → DOM; no per-kind
logic.
- <FloorplanRegistryLayer> reads the active levelId, walks the level
subtree, looks up each node's def.floorplan, builds a
GeometryContext, calls the builder, and renders the output via
FloorplanGeometryRenderer.
- Mounted in floorplan-panel.tsx just before <FloorplanMarqueeLayer>
so registry-driven kinds layer above legacy inline content.
Shelf migration (proof port):
- New nodes/src/shelf/floorplan.ts — buildShelfFloorplan(node) emits
a group with the rotation/translation transform and a width × depth
rectangle in the shelf's color. Brackets omitted (hidden under top
board from above).
- Wired to shelfDefinition.floorplan. Shelf now appears in the floor
plan view for the first time (was missing from the legacy panel's
inline switch).
Pattern proven; every future kind migrating in Phase 5 follows the
same shape: a pure (node, ctx) => FloorplanGeometry function. As kinds
register their floor-plan builders, the corresponding inline branches
in floorplan-panel.tsx become dead code and can be deleted in the
same PR.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
