Phase 5 batch: door + window migrate to registry (always-on)

Both kinds share traits — hosted on walls, cuttable, animated open/
close state via a geometry system + animation system. Stage A
migration: register + wrap-export the legacy renderer + bundle both
per-kind systems. Pure geometry + floor-plan ports are later
milestones.

Files added (packages/nodes/src/door/, packages/nodes/src/window/):
 - schema.ts: re-export from core.
 - parametrics.ts: minimal — dimensions only. Door has 29 sliders +
   segmented controls + presets in its legacy panel; window has 15+
   sliders. Auto-inspector can't cover them at Stage A — legacy
   panel keeps rendering via panel-manager.tsx case fall-through.
   Stage E may extend parametrics or use parametrics.customPanel
   escape hatch.
 - definition.ts: capabilities (no `movable` — wall-bound drag is
   bespoke; capability-driven dispatch keeps legacy MoveDoorTool /
   MoveWindowTool), parametrics, renderer, system. defaults() uses
   `DoorNode.parse({...stub})` to leverage zod's schema-level
   `.default()` annotations — door has 40+ fields, window has 20+;
   listing them inline duplicates the schema.
 - renderer.tsx: wrap-export of legacy DoorRenderer / WindowRenderer
   (thin 33-36 lines each).
 - system.tsx: bundles each kind's TWO systems — DoorSystem +
   DoorAnimationSystem, WindowSystem + WindowAnimationSystem. Both
   per-kind systems mount via RegisteredSystems when the kind is
   registry-driven; `<LegacySystem kind="door|window">` wrappers
   around each individual system short-circuit.
 - index.ts: barrel.

Files changed:
 - packages/viewer/src/index.ts: new public exports for DoorRenderer,
   DoorSystem, DoorAnimationSystem, WindowRenderer, WindowSystem,
   WindowAnimationSystem.
 - packages/nodes/src/index.ts: appends doorDefinition + windowDefinition.
 - packages/editor/src/components/ui/panels/door-panel.tsx + window-
   panel.tsx: panel slider-drag fix recipe applied. Drop the
   subscribed `updateNode` action, drop the `node` dep from
   handleUpdate / previewDoorUpdate / commitDoorPreview useCallbacks.
   Use useScene.getState() inside. Door panel has 29 SliderControls,
   window 15+ — both at high risk of the Maximum update depth
   cascade without the fix.

Phase 5 progress: shelf ✅, spawn ✅, wall ✅, fence ✅, slab ✅, ceiling ✅,
door ✅, window ✅. Eight kinds on the registry. Item / stair / roof /
zone / containers remain.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/viewer/src/index.ts

@@ -8,7 +8,12 @@
 // to duplicate at Stage A. Wrap-exported here, ported into the nodes
 // folder in a later stage.
 export { CeilingRenderer } from './components/renderers/ceiling/ceiling-renderer'
+// Door + window internals for registry-driven door / window definitions.
+// Each kind has a geometry system + animation system to mount via
+// RegisteredSystems when the kind is registry-driven.
+export { DoorRenderer } from './components/renderers/door/door-renderer'
 export { NodeRenderer } from './components/renderers/node-renderer'
+export { WindowRenderer } from './components/renderers/window/window-renderer'
 export { default as Viewer } from './components/viewer'
 export type { HoverStyle, HoverStyles } from './components/viewer/post-processing'
 export {
@@ -38,6 +43,8 @@ export {
 export { mergedOutline } from './lib/merged-outline-node'
 export { default as useViewer } from './store/use-viewer'
 export { CeilingSystem } from './systems/ceiling/ceiling-system'
+export { DoorAnimationSystem } from './systems/door/door-animation-system'
+export { DoorSystem } from './systems/door/door-system'
 // Fence system follows the wall re-export pattern — composed into the
 // registry-driven fence definition's `def.system`. Removed in Phase 6
 // alongside the legacy fence mount point.
@@ -57,3 +64,5 @@ export { getVisibleWallMaterials } from './systems/wall/wall-materials'
 // 800+ lines of CSG / mitering logic during Phase 3. These exports are
 // removed in Phase 6 when the legacy mount points are deleted.
 export { WallSystem } from './systems/wall/wall-system'
+export { WindowAnimationSystem } from './systems/window/window-animation-system'
+export { WindowSystem } from './systems/window/window-system'