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/SkinnedColliderBaker.cs

@@ -73,30 +73,12 @@ public class SkinnedColliderBaker : MonoBehaviour
         // renderer), and MeshPainter / ConcealmentMeter — which raise the baked mesh to world via
         // localToWorldMatrix — stay correct at any player scale. No-op (and untouched) at scale 1; the
         // uniform divide is rotation-independent, which the player's uniform scale guarantees.
-        Vector3 ls = transform.lossyScale;
-        if (ls.x != 1f || ls.y != 1f || ls.z != 1f)
-            RescaleToUnitScale(ls);
+        GeometryUtil.RescaleToUnitScale(_baked, transform.lossyScale, _vbuf);
 
         _collider.sharedMesh = null;   // force a physics re-cook of the new geometry
         _collider.sharedMesh = _baked;
     }
 
-    private void RescaleToUnitScale(Vector3 lossyScale)
-    {
-        float ix = lossyScale.x != 0f ? 1f / lossyScale.x : 0f;
-        float iy = lossyScale.y != 0f ? 1f / lossyScale.y : 0f;
-        float iz = lossyScale.z != 0f ? 1f / lossyScale.z : 0f;
-        _baked.GetVertices(_vbuf);
-        for (int i = 0; i < _vbuf.Count; i++)
-        {
-            Vector3 v = _vbuf[i];
-            v.x *= ix; v.y *= iy; v.z *= iz;
-            _vbuf[i] = v;
-        }
-        _baked.SetVertices(_vbuf);
-        _baked.RecalculateBounds();
-    }
-
     private void OnDestroy()
     {
         if (_baked) Destroy(_baked);