fix(world): restore multi-frame shadow warmup and unblock fabrik doorway

- Lighting: replace single-frame needsUpdate with a 3-rAF warmup that forces
  scene.updateMatrixWorld + sun.shadow.needsUpdate + gl.shadowMap.needsUpdate.
  This restores the SceneShadowWarmup behaviour (deleted in 777e51e) inline,
  so shadows survive Physics Suspense remounts and webglcontextrestored.
- octreeCollisionConfig: remove (comment out) the thin LA_FABRIK interior box
  at x=-6.93 that was sealing the doorway despite the mesh hole; fabrik mesh
  octree already provides surrounding wall collision.
- DebugOctreeVisualization: add Fabrik-only filter to inspect interior
  collisions/non-collisions in isolation.

src/hooks/debug/useDebugVisualsDebug.ts

@@ -11,6 +11,7 @@ export function useDebugVisualsDebug(): void {
       octreeMaxDepth: state.octreeMaxDepth,
       octreeLeavesOnly: state.octreeLeavesOnly,
       octreeOpacity: state.octreeOpacity,
+      octreeFabrikOnly: state.octreeFabrikOnly,
     };
 
     folder
@@ -54,5 +55,12 @@ export function useDebugVisualsDebug(): void {
       .onChange((value: number) => {
         useDebugVisualsStore.getState().setOctreeOpacity(value);
       });
+
+    folder
+      .add(controls, "octreeFabrikOnly")
+      .name("Octree Fabrik Only")
+      .onChange((value: boolean) => {
+        useDebugVisualsStore.getState().setOctreeFabrikOnly(value);
+      });
   });
 }