* feat(editor): level-scoped alignment, reference-floor registry symbols, registry slab tool
- Scope alignment candidates to the active level so a node directly below
on another floor no longer snaps (alignment is XZ-only); building-scoped
nodes like elevator shafts stay in the pool across floors.
- Derive the elevator alignment footprint from its outer shaft (not the
inset cab), so its guide actually surfaces within the snap threshold.
- Extract shared stair footprint geometry (rotateXZ, segment transforms,
stairFootprintAABB) so opening-sync and alignment anchors derive the
chain identically; stairs now contribute plan bbox anchors.
- Render reference-floor stairs/roofs/elevators/shelves/spawns through
their registry floorplan builders for pixel-identical symbols.
- Move slab creation to the registry-driven slab tool (parity with
ceiling); 2D handlers only maintain draft state.
- Lift the 3D alignment guide ribbon to the active level's Y each frame.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* refactor(core): registry-drive elevator/stair alignment footprints
Address architecture review of the level-scoped alignment work: the core
anchor bridge (`alignment-anchors.ts`) hardcoded `if (node.type === 'elevator')`
and `if (node.type === 'stair')` branches to derive their plan footprints.
Move that onto the kinds themselves via a new `alignmentFootprint` capability
so the bridge dispatches generically — matching the registry composition model.
- Add `Capabilities.alignmentFootprint`: returns a `box` (rotatable rect
centred on position, relocatable for movable kinds) or an `aabb` (already
resolved, for non-rectangular plan shapes). Elevator uses `box` (its outer
shaft, and it's movable); stair uses `aabb` (segment chain / annular sector,
moves by origin).
- Drop both hardcoded branches; the bridge now consults the capability via
`floorFootprint` (box) and a unified `alignmentAABB` (box ∪ aabb).
- Export `stairFootprintAABB` from core so the stair definition consumes it.
- Tests register synthetic defs carrying the capability (the bridge no longer
knows elevator/stair by name), reproducing the production glue from the same
core helpers.
- Document why `REFERENCE_REGISTRY_KINDS` is a deliberate editor-local
curation, not an auto-derived set (most floorplan-builder kinds shouldn't
appear as standalone reference symbols, and "reference floor" is an editor
concept core must not know).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
* fix(editor): hide node arrow handles during thumbnail capture
The arrow-handle rig lives on SCENE_LAYER (so its chevrons read as proper
3D plates), but the thumbnail camera only filters EDITOR_LAYER + GRID_LAYER —
so a node selected at capture time would leak its arrows into the snapshot.
Hide the rig on `thumbnail:before-capture` and restore it on
`thumbnail:after-capture`, the same emitter handshake SelectionManager uses.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
