Refactor: extract shared helpers across scripts, trim remaining doc redundancy

Deduplication pass (44 extractions):
- New SmoothedLook: shared smoothed yaw/pitch look tick + view seeding
  (FirstPersonController, FreeCamController)
- New CharacterTeleport: disable-CC-around-teleport idiom (rescue,
  owner position apply, free-cam sync)
- New GeometryUtil: RescaleToUnitScale + TransformBounds (concealment
  meter/volume, skinned collider baker)
- Paint family: canonical map read/write shared between Net and
  Persistence, snapshot decode, backend stroke dispatch, RebuildBackend,
  ResolveSeed, chunked RPC send/gate/copy, CamoKnobs/HeightKnobs
  aggregates, SanitizeFileKey, NewMaskTexture, AdoptAlbedo, FindSlider
- Player/modes: GameMode SetPlayerControl/SetPainting/SetOrbitInputEnabled,
  InputUtil.GameplayKeyPressed, NearestClimbHit, ComputeXRay delegates to
  ComputeResolutionFreeze, FingerIK TryInPlaneAngle
- Match/misc: UnhookSessionCallbacks, SendEmptyNamedMessage, SwapScenes,
  RunSessionOpAsync, CovarianceEigen, CollectClusterPoints, MatchHud
  GUIStyle cache, HsvColorPicker rehook, VoxelCenter

Documentation pass: remove 6 triplicated doc blocks and 2 restating
inline comments left after the previous reduction.

Behavior-neutral; hot-path rasterizer loops intentionally untouched.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Assets/Scripts/ConcealmentVolume.cs

@@ -60,16 +60,9 @@ public class ConcealmentVolume : MonoBehaviour
         {
             Vector3 mn = origin;
             Vector3 mx = origin + new Vector3(nx * voxelSize, ny * voxelSize, nz * voxelSize);
-            Matrix4x4 m = transform.localToWorldMatrix;
-            Bounds b = new Bounds(m.MultiplyPoint3x4(mn), Vector3.zero);
-            b.Encapsulate(m.MultiplyPoint3x4(new Vector3(mx.x, mn.y, mn.z)));
-            b.Encapsulate(m.MultiplyPoint3x4(new Vector3(mn.x, mx.y, mn.z)));
-            b.Encapsulate(m.MultiplyPoint3x4(new Vector3(mn.x, mn.y, mx.z)));
-            b.Encapsulate(m.MultiplyPoint3x4(new Vector3(mx.x, mx.y, mn.z)));
-            b.Encapsulate(m.MultiplyPoint3x4(new Vector3(mx.x, mn.y, mx.z)));
-            b.Encapsulate(m.MultiplyPoint3x4(new Vector3(mn.x, mx.y, mx.z)));
-            b.Encapsulate(m.MultiplyPoint3x4(mx));
-            return b;
+            var local = new Bounds();
+            local.SetMinMax(mn, mx);
+            return GeometryUtil.TransformBounds(transform.localToWorldMatrix, local);
         }
     }
 
@@ -184,13 +177,7 @@ public class ConcealmentVolume : MonoBehaviour
                     bool enclosed = useFlood && !outside[idx];
                     bool solid = false;
                     if (useWinding)
-                    {
-                        Vector3 cWorldLocal = new Vector3(
-                            origin.x + (ix + 0.5f) * vs,
-                            origin.y + (iy + 0.5f) * vs,
-                            origin.z + (iz + 0.5f) * vs);
-                        solid = WindingNumber(cWorldLocal, verts, tris) > 0.5;
-                    }
+                        solid = WindingNumber(VoxelCenter(origin, ix, iy, iz, vs), verts, tris) > 0.5;
                     bool inside = enclosed || solid;
                     if (!inside) continue;
                     bits[idx >> 5] |= 1u << (idx & 31);
@@ -253,6 +240,10 @@ public class ConcealmentVolume : MonoBehaviour
         return sum / (4.0 * System.Math.PI);
     }
 
+    /// <summary>Local-space center of grid voxel (ix, iy, iz).</summary>
+    private static Vector3 VoxelCenter(Vector3 origin, int ix, int iy, int iz, float size)
+        => new Vector3(origin.x + (ix + 0.5f) * size, origin.y + (iy + 0.5f) * size, origin.z + (iz + 0.5f) * size);
+
     private void OnDrawGizmosSelected()
     {
         if (!drawBakedGizmos || !HasBake) return;
@@ -265,11 +256,7 @@ public class ConcealmentVolume : MonoBehaviour
                 {
                     int idx = ix + nx * (iy + ny * iz);
                     if ((bits[idx >> 5] & (1u << (idx & 31))) == 0) continue;
-                    Vector3 c = new Vector3(
-                        origin.x + (ix + 0.5f) * voxelSize,
-                        origin.y + (iy + 0.5f) * voxelSize,
-                        origin.z + (iz + 0.5f) * voxelSize);
-                    Gizmos.DrawCube(c, cube);
+                    Gizmos.DrawCube(VoxelCenter(origin, ix, iy, iz, voxelSize), cube);
                 }
     }
 #endif