Add baked voxel concealment volumes for concave furniture

Replace unreliable raycast parity on open-shell meshes with editor-baked
voxel grids. ConcealmentVolume bakes an inside-mask per object using the
union of a generalized-winding-number test (solid material, robust to open
shells) and an exterior flood-fill (enclosed cavities). ConcealmentMeter
now prefers baked volumes via an O(1) world-space lookup through a registry,
falling back to the old concave parity only for un-baked colliders.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Assets/Scenes/SampleScene.unity

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       insertIndex: -1
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+    - targetCorrespondingSourceObject: {fileID: 156146, guid: 62a7d5dd45994494182ff5c1d8da0d3c, type: 3}
+      insertIndex: -1
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   m_SourcePrefab: {fileID: 100100000, guid: 62a7d5dd45994494182ff5c1d8da0d3c, type: 3}
 --- !u!4 &753428817 stripped
 Transform:
@@ -4678,7 +4681,7 @@ MonoBehaviour:
     serializedVersion: 2
     m_Bits: 4294967295
   includeConcaveMeshColliders: 0
-  includeTerrain: 1
+  includeTerrain: 0
   evaluateInterval: 0.1
   evaluateInPlayMode: 1
   drawGizmos: 0
@@ -5006,6 +5009,30 @@ MeshCollider:
   m_Convex: 0
   m_CookingOptions: 30
   m_Mesh: {fileID: 4300000, guid: 6bb1e412df9cd4efd8941377ebabb1be, type: 3}
+--- !u!114 &1260370193
+MonoBehaviour:
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+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 1260370184}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 0a59a347a3128354ebd4f84afc97a0c5, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: Assembly-CSharp::ConcealmentVolume
+  resolution: 48
+  sourceMesh: {fileID: 0}
+  method: 0
+  drawBakedGizmos: 0
+  gizmoColor: {r: 0.2, g: 0.6, b: 1, a: 0.35}
+  origin: {x: -1.102527, y: -0.6764439, z: -0.04410102}
+  voxelSize: 0.044101078
+  nx: 50
+  ny: 31
+  nz: 15
+  bits: 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+  insideCount: 2891
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 GameObject:
   m_ObjectHideFlags: 0
@@ -6414,6 +6441,30 @@ MeshCollider:
   m_Convex: 0
   m_CookingOptions: 30
   m_Mesh: {fileID: 4300000, guid: 0727ba69b779d42a0978a362226fad3e, type: 3}
+--- !u!114 &1666568584
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 1666568576}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 0a59a347a3128354ebd4f84afc97a0c5, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: Assembly-CSharp::ConcealmentVolume
+  resolution: 48
+  sourceMesh: {fileID: 0}
+  method: 0
+  drawBakedGizmos: 0
+  gizmoColor: {r: 0.2, g: 0.6, b: 1, a: 0.35}
+  origin: {x: -1.3557315, y: -0.70876616, z: -0.054229498}
+  voxelSize: 0.05422926
+  nx: 50
+  ny: 26
+  nz: 27
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+  insideCount: 15957
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 PhysicsMaterial:
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@@ -7200,6 +7251,9 @@ PrefabInstance:
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       insertIndex: -1
       addedObject: {fileID: 1260370189}
+    - targetCorrespondingSourceObject: {fileID: 133438, guid: 6f95ff39b42c3414d9a7ced2eea58274, type: 3}
+      insertIndex: -1
+      addedObject: {fileID: 1260370193}
   m_SourcePrefab: {fileID: 100100000, guid: 6f95ff39b42c3414d9a7ced2eea58274, type: 3}
 --- !u!4 &1860487068 stripped
 Transform: