Refactor scripts: dedup remainder, remove dead code, perf hardening

Iteration 4 over Assets/Scripts (no component/file splits, no Unity assets touched):

Dedup:
- Route inline cursor-release, material guards, Ctrl-held and undo/redo
  input through existing InputUtil / SetMatFloat helpers
- Add ungated InputUtil.KeyPressedThisFrame; GameplayKeyPressed builds on it
- Unify FindDeep/FindDeepChild into GeometryUtil.FindDeep

Dead code / stale docs:
- Remove unused code-gen bake path (HsvColorPicker.Build, PaintHud factory)
- Drop unreferenced symbols (SubPhaseChanged event, LocalPhaseDuration,
  IsLocalSceneMain, MouseSensitivity.Changed, IsPaused, InSession,
  NetworkControlled, PreviousPose, JointCount, voxel-count accessors)
- Fix incorrect PlayerRole / PaintHud / Pick / PlayerPose docs

Perf / robustness (behaviour-neutral):
- ConcealmentMeter.Evaluate: reuse vertex/topology buffers, two-pointer
  crossing count
- BuildMeshCaches: alloc-free vertex copy, cached topology/UVs
- Guard all PlayerPaintSync LogSync sites behind logSync
- Cache LocalViewerIsHunter / controller / CanShoot / TypingGuard lookups;
  dedup LocalIsHunter with MatchHud
- Change-guard RefreshEmissionColor and HeroCutout.Disarm
- Cache scene/countdown string comparisons per frame
- Grow NonAlloc buffers and log-once on saturation

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

Assets/Scripts/NetworkPlayerSetup.cs

@@ -108,6 +108,7 @@ public class NetworkPlayerSetup : NetworkBehaviour
 
     private MeshPainter _painter;          // owns the per-avatar material instance carrying _XRayColor
     private ConcealmentMeter _concealment; // owner-only embedded-percent source (disabled on remotes)
+    private PlayerCharacterController _controller; // sibling, cached (the freeze re-asserts per frame)
     private bool _xrayApplied;
     private bool _lastXRay;
     private bool _frozenApplied;
@@ -125,7 +126,7 @@ public class NetworkPlayerSetup : NetworkBehaviour
         if (IsServer && _conversionSpawnPos.HasValue)
             _spawnOverride.Value = _conversionSpawnPos.Value;
 
-        var controller = GetComponent<PlayerCharacterController>();
+        var controller = _controller = GetComponent<PlayerCharacterController>();
 
         if (IsOwner)
         {
@@ -236,11 +237,8 @@ public class NetworkPlayerSetup : NetworkBehaviour
     {
         bool freeze = ComputeResolutionFreeze();
 
-        if (freeze && IsOwner)
-        {
-            var controller = GetComponent<PlayerCharacterController>();
-            if (controller) controller.ControlEnabled = false;
-        }
+        if (freeze && IsOwner && _controller)
+            _controller.ControlEnabled = false;
 
         if (_frozenApplied && freeze == _lastFrozen) return;
         _lastFrozen = freeze;
@@ -362,14 +360,24 @@ public class NetworkPlayerSetup : NetworkBehaviour
     }
 
     // True if THIS machine's local player is a Hunter role variant (so it must not see hiders during hide).
-    private static bool LocalViewerIsHunter()
+    // Shared with MatchHud. Called per frame per avatar during hide/seek, so the GetComponent result is
+    // cached per local PlayerObject; a respawn/conversion swaps the object and refreshes the cache.
+    private static NetworkObject _localViewerPo;
+    private static bool _localViewerIsHunter;
+
+    internal static bool LocalViewerIsHunter()
     {
         var nm = NetworkManager.Singleton;
         if (!nm || nm.LocalClient == null) return false;
         var po = nm.LocalClient.PlayerObject;
         if (!po) return false;
-        var setup = po.GetComponent<NetworkPlayerSetup>();
-        return setup && setup.ScopedModes && setup.Role == PlayerRole.Hunter;
+        if (po != _localViewerPo)
+        {
+            _localViewerPo = po;
+            var setup = po.GetComponent<NetworkPlayerSetup>();
+            _localViewerIsHunter = setup && setup.ScopedModes && setup.Role == PlayerRole.Hunter;
+        }
+        return _localViewerIsHunter;
     }
 
     /// <summary>