Add concealment meter and skinned collider baker; reorganize assets

- ConcealmentMeter: standalone component measuring the percentage of the
  character volume embedded inside environment geometry (bake -> voxelize via
  column ray-stabbing parity -> classify interior voxels against box/sphere/
  capsule/convex colliders and terrain). Always-on, throttled, gizmo debug.
- SkinnedColliderBaker: sole per-frame collider bake owner for skinned rigs.
  MeshPainter now delegates baking and only borrows BakedMesh for the GPU
  raster and cache refresh, so the collider stays fresh outside paint mode.
- Move pose assets to Assets/Poses, retire unused Insect scripts to
  Assets/Unused, restore Paintman.controller; mode scripts and scene updated.

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

Assets/Scripts/MeshPainter.Setup.cs

@@ -10,13 +10,22 @@ public partial class MeshPainter
         if (!_collider) _collider = gameObject.AddComponent<MeshCollider>();
         _collider.convex = false; // non-convex provides triangleIndex / textureCoord
 
-        _bakedMesh = new Mesh { name = "MeshPainter_Baked" };
+        // An always-on SkinnedColliderBaker (skinned rigs only) owns the bake even outside paint
+        // mode; we delegate to it and only borrow its mesh. Without one we keep our own legacy bake.
+        _baker = _skinned ? GetComponent<SkinnedColliderBaker>() : null;
+        if (!_baker) _bakedMesh = new Mesh { name = "MeshPainter_Baked" };
         BakeColliderMesh();
     }
 
     private void BakeColliderMesh()
     {
-        if (_skinned)
+        if (_baker)
+        {
+            // Baker already baked (negative execution order) and keeps _collider.sharedMesh fresh;
+            // we only track its mesh for the GPU raster path. No bake here - that's the whole point.
+            _bakedMesh = _baker.BakedMesh;
+        }
+        else if (_skinned)
         {
             // Static skinned mesh: bake into local coordinates (scale = 1).
             _skinned.BakeMesh(_bakedMesh);