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/editor/src/components/tools/tool-manager.tsx

@@ -204,12 +204,31 @@ export const ToolManager: React.FC = () => {
               <SlabHoleEditor holeIndex={editingHole.holeIndex} slabId={selectedSlabId} />
             )
           })()}
-        {showCeilingBoundaryEditor && selectedCeilingId && (
-          <CeilingBoundaryEditor ceilingId={selectedCeilingId} />
-        )}
-        {showCeilingHoleEditor && selectedCeilingId && editingHole && (
-          <CeilingHoleEditor ceilingId={selectedCeilingId} holeIndex={editingHole.holeIndex} />
-        )}
+        {showCeilingBoundaryEditor &&
+          selectedCeilingId &&
+          (() => {
+            const Registry = getRegistryAffordanceTool('ceiling', 'boundary-edit')
+            return Registry ? (
+              <Suspense fallback={null}>
+                <Registry ceilingId={selectedCeilingId} />
+              </Suspense>
+            ) : (
+              <CeilingBoundaryEditor ceilingId={selectedCeilingId} />
+            )
+          })()}
+        {showCeilingHoleEditor &&
+          selectedCeilingId &&
+          editingHole &&
+          (() => {
+            const Registry = getRegistryAffordanceTool('ceiling', 'hole-edit')
+            return Registry ? (
+              <Suspense fallback={null}>
+                <Registry ceilingId={selectedCeilingId} holeIndex={editingHole.holeIndex} />
+              </Suspense>
+            ) : (
+              <CeilingHoleEditor ceilingId={selectedCeilingId} holeIndex={editingHole.holeIndex} />
+            )
+          })()}
         {movingWallEndpoint && <MoveWallEndpointTool target={movingWallEndpoint} />}
         {movingFenceEndpoint &&
           (() => {