Phase 5 Stage D ceiling: port placement + move + boundary/hole editors

Replicates the slab Stage D recipe for ceiling: four affordances
routed through the registry — def.tool for the placement flow,
def.affordanceTools for boundary edit / hole edit / whole-ceiling move.

Ceiling-specific bits preserved:
- Placement tool keeps the dual-cursor + vertical TSL-gradient
  connector + ground-shadow lines (1:1 with legacy).
- Move tool wrapper renders the translucent preview fill + outline
  overlay so the user sees the destination before clicking.

ToolManager mount sites for CeilingBoundaryEditor / CeilingHoleEditor
now route through `getRegistryAffordanceTool` with legacy fallback.

Per-kind progress: ceiling A ✅ B (n/a, def.renderer escape hatch
preserved) C ✅ D ✅; E + F pending.

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

packages/nodes/src/ceiling/definition.ts

@@ -54,6 +54,19 @@ export const ceilingDefinition: NodeDefinition<typeof CeilingNode> = {
 
   parametrics: ceilingParametrics,
 
+  // Stage D: kind-owned placement tool. Multi-click polygon drawing
+  // with a vertical TSL-gradient connector + ground-shadow lines.
+  tool: () => import('./tool'),
+
+  // Stage D: drag/edit affordances. Boundary editor + hole editor
+  // delegate to the shared `<PolygonEditor>`; move uses the single-
+  // undo dance.
+  affordanceTools: {
+    'boundary-edit': () => import('./boundary-editor'),
+    'hole-edit': () => import('./hole-editor'),
+    move: () => import('./move-tool'),
+  },
+
   renderer: {
     kind: 'parametric',
     module: () => import('./renderer'),