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/components/debug/DebugOctreeVisualization.tsx

@@ -1,6 +1,10 @@
 import { useMemo } from "react";
 import { Box3, BufferAttribute, BufferGeometry } from "three";
 import type { Octree } from "three-stdlib";
+import {
+  LA_FABRIK_CENTER,
+  isInsideLaFabrikFootprint,
+} from "@/data/world/laFabrikConfig";
 import { useDebugVisualsStore } from "@/managers/stores/useDebugVisualsStore";
 
 interface DebugOctreeVisualizationProps {
@@ -18,8 +22,12 @@ interface CollectOptions {
   minDepth: number;
   maxDepth: number;
   leavesOnly: boolean;
+  fabrikOnly: boolean;
 }
 
+const FABRIK_FILTER_PADDING = 1.5;
+const FABRIK_FILTER_VERTICAL = 8;
+
 const BOX_VERTEX_INDEX_PAIRS: ReadonlyArray<readonly [number, number]> = [
   [0, 1],
   [1, 3],
@@ -35,6 +43,24 @@ const BOX_VERTEX_INDEX_PAIRS: ReadonlyArray<readonly [number, number]> = [
   [3, 7],
 ];
 
+function boxIntersectsFabrik(box: Box3): boolean {
+  if (box.max.y < LA_FABRIK_CENTER[1] - FABRIK_FILTER_VERTICAL) return false;
+  if (box.min.y > LA_FABRIK_CENTER[1] + FABRIK_FILTER_VERTICAL) return false;
+
+  // Sample box corners + center on XZ plane against the rotated fabrik footprint.
+  const samples: ReadonlyArray<readonly [number, number]> = [
+    [box.min.x, box.min.z],
+    [box.min.x, box.max.z],
+    [box.max.x, box.min.z],
+    [box.max.x, box.max.z],
+    [(box.min.x + box.max.x) * 0.5, (box.min.z + box.max.z) * 0.5],
+  ];
+  for (const [x, z] of samples) {
+    if (isInsideLaFabrikFootprint(x, z, FABRIK_FILTER_PADDING)) return true;
+  }
+  return false;
+}
+
 function collectOctreeBoxes(
   node: Octree,
   options: CollectOptions,
@@ -47,8 +73,10 @@ function collectOctreeBoxes(
   const passesDepth = depth >= options.minDepth;
   const passesLeafFilter = !options.leavesOnly || isLeaf;
   const hasTriangles = node.triangles.length > 0;
+  const passesFabrikFilter =
+    !options.fabrikOnly || boxIntersectsFabrik(node.box);
 
-  if (passesDepth && passesLeafFilter && hasTriangles) {
+  if (passesDepth && passesLeafFilter && hasTriangles && passesFabrikFilter) {
     acc.push({
       box: node.box,
       depth,
@@ -114,6 +142,7 @@ export function DebugOctreeVisualization({
   const maxDepth = useDebugVisualsStore((state) => state.octreeMaxDepth);
   const leavesOnly = useDebugVisualsStore((state) => state.octreeLeavesOnly);
   const opacity = useDebugVisualsStore((state) => state.octreeOpacity);
+  const fabrikOnly = useDebugVisualsStore((state) => state.octreeFabrikOnly);
 
   const geometry = useMemo(() => {
     if (!octree || !showOctree) return null;
@@ -121,10 +150,11 @@ export function DebugOctreeVisualization({
       minDepth,
       maxDepth,
       leavesOnly,
+      fabrikOnly,
     });
     if (boxes.length === 0) return null;
     return buildOctreeLineGeometry(boxes);
-  }, [leavesOnly, maxDepth, minDepth, octree, showOctree]);
+  }, [fabrikOnly, leavesOnly, maxDepth, minDepth, octree, showOctree]);
 
   if (!geometry) return null;
 

src/data/world/octreeCollisionConfig.ts

@@ -23,10 +23,14 @@ export const MAP_OCTREE_COLLISION_BOXES = {
 } as const satisfies Record<string, MapOctreeCollisionBox>;
 
 export const LA_FABRIK_INTERIOR_COLLISION_BOXES = [
-  {
-    center: [-6.9351, 2.278, -0.0001],
-    size: [0.2, 1.94, 3.711],
-  },
+  // NOTE: removed — this thin wall (size [0.2, 1.94, 3.71]) sat at x≈-6.93 and
+  // sealed the doorway despite the geometry having a hole there. The fabrik
+  // mesh octree already provides the surrounding wall collision, so this
+  // proxy was both redundant and bug-causing.
+  // {
+  //   center: [-6.9351, 2.278, -0.0001],
+  //   size: [0.2, 1.94, 3.711],
+  // },
   {
     center: [0.8026, 0.719, -3.639],
     size: [4.346, 1.108, 1.181],

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);
+      });
   });
 }

src/managers/stores/useDebugVisualsStore.ts

@@ -13,6 +13,8 @@ interface DebugVisualsStore {
   setOctreeLeavesOnly: (value: boolean) => void;
   octreeOpacity: number;
   setOctreeOpacity: (value: number) => void;
+  octreeFabrikOnly: boolean;
+  setOctreeFabrikOnly: (value: boolean) => void;
 }
 
 export const useDebugVisualsStore = create<DebugVisualsStore>((set) => ({
@@ -28,4 +30,6 @@ export const useDebugVisualsStore = create<DebugVisualsStore>((set) => ({
   setOctreeLeavesOnly: (octreeLeavesOnly) => set({ octreeLeavesOnly }),
   octreeOpacity: 0.35,
   setOctreeOpacity: (octreeOpacity) => set({ octreeOpacity }),
+  octreeFabrikOnly: false,
+  setOctreeFabrikOnly: (octreeFabrikOnly) => set({ octreeFabrikOnly }),
 }));

src/world/Lighting.tsx

@@ -53,6 +53,18 @@ function configureSunShadow(sun: DirectionalLight, sunTarget: Object3D): void {
   sun.shadow.camera.updateProjectionMatrix();
 }
 
+function forceShadowPass(
+  gl: WebGLRenderer,
+  scene: Scene,
+  sun: DirectionalLight,
+): void {
+  scene.updateMatrixWorld(true);
+  sun.updateMatrixWorld(true);
+  sun.shadow.camera.updateProjectionMatrix();
+  sun.shadow.needsUpdate = true;
+  gl.shadowMap.needsUpdate = true;
+}
+
 // [diag] temporary helper: count shadow-casting/receiving meshes in the scene
 function snapshotShadowMeshes(scene: Scene): {
   meshCount: number;
@@ -76,6 +88,7 @@ export function Lighting(): React.JSX.Element {
   const camera = useThree((state) => state.camera);
   const gl = useThree((state) => state.gl);
   const scene = useThree((state) => state.scene);
+  const invalidate = useThree((state) => state.invalidate);
   const ambient = useRef<AmbientLight>(null);
   const sun = useRef<DirectionalLight>(null);
   const sunTarget = useRef<Object3D>(null);
@@ -86,7 +99,25 @@ export function Lighting(): React.JSX.Element {
 
     configureSunShadow(sun.current, sunTarget.current);
     configureRendererShadows(gl);
-    sun.current.shadow.needsUpdate = true;
+
+    // Multi-frame shadow warmup: forces the shadow pass over 3 consecutive
+    // frames so newly mounted meshes (loaded asynchronously by Suspense) get
+    // their world matrices and shadow map properly allocated. Without this,
+    // shadows can fail to render after a Physics Suspense remount.
+    let raf1 = 0;
+    let raf2 = 0;
+    forceShadowPass(gl, scene, sun.current);
+    invalidate();
+    raf1 = window.requestAnimationFrame(() => {
+      if (!sun.current) return;
+      forceShadowPass(gl, scene, sun.current);
+      invalidate();
+      raf2 = window.requestAnimationFrame(() => {
+        if (!sun.current) return;
+        forceShadowPass(gl, scene, sun.current);
+        invalidate();
+      });
+    });
 
     // [diag] one-shot scene snapshot to count shadow casters/receivers
     const counts = snapshotShadowMeshes(scene);
@@ -110,16 +141,19 @@ export function Lighting(): React.JSX.Element {
         timestamp: performance.now().toFixed(0),
       });
       if (sun.current) {
-        sun.current.shadow.needsUpdate = true;
+        forceShadowPass(gl, scene, sun.current);
+        invalidate();
       }
     };
     canvas.addEventListener("webglcontextlost", handleContextLost);
     canvas.addEventListener("webglcontextrestored", handleContextRestored);
     return () => {
+      window.cancelAnimationFrame(raf1);
+      window.cancelAnimationFrame(raf2);
       canvas.removeEventListener("webglcontextlost", handleContextLost);
       canvas.removeEventListener("webglcontextrestored", handleContextRestored);
     };
-  }, [gl, scene]);
+  }, [gl, invalidate, scene]);
 
   useDebugFolder("Lighting", (folder) => {
     folder.addColor(LIGHTING_STATE, "ambientColor").name("Ambient Color");