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/MatchManager.cs

@@ -233,20 +233,26 @@ public class MatchManager : MonoBehaviour
             _net.OnClientStarted -= OnClientStarted;
             _net.OnServerStopped -= OnNetStopped;
             _net.OnClientStopped -= OnNetStopped;
-            _net.OnClientConnectedCallback -= OnClientConnected;
-            _net.OnClientDisconnectCallback -= OnClientDisconnected;
-            if (_net.SceneManager != null) _net.SceneManager.OnSceneEvent -= OnSceneEvent;
-            if (_net.CustomMessagingManager != null)
-            {
-                _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgAuthorityGranted);
-                _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgRequestEndMatch);
-                _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgPhase);
-                _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgReportHit);
-            }
+            UnhookSessionCallbacks();
         }
         if (Instance == this) Instance = null;
     }
 
+    // Unhooks the per-session callbacks and named-message handlers (shared by OnDisable and OnNetStopped).
+    private void UnhookSessionCallbacks()
+    {
+        _net.OnClientConnectedCallback -= OnClientConnected;
+        _net.OnClientDisconnectCallback -= OnClientDisconnected;
+        if (_net.SceneManager != null) _net.SceneManager.OnSceneEvent -= OnSceneEvent;
+        if (_net.CustomMessagingManager != null)
+        {
+            _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgAuthorityGranted);
+            _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgRequestEndMatch);
+            _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgPhase);
+            _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgReportHit);
+        }
+    }
+
     private void OnServerStarted()
     {
         _cleanedUp = false;
@@ -313,19 +319,7 @@ public class MatchManager : MonoBehaviour
         Phase = MatchPhase.Lobby;
         ApplyPhaseLocal(MatchSubPhase.None, 0f, _localMode);
         _pendingHiders.Clear();
-        if (_net)
-        {
-            _net.OnClientConnectedCallback -= OnClientConnected;
-            _net.OnClientDisconnectCallback -= OnClientDisconnected;
-            if (_net.SceneManager != null) _net.SceneManager.OnSceneEvent -= OnSceneEvent;
-            if (_net.CustomMessagingManager != null)
-            {
-                _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgAuthorityGranted);
-                _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgRequestEndMatch);
-                _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgPhase);
-                _net.CustomMessagingManager.UnregisterNamedMessageHandler(MsgReportHit);
-            }
-        }
+        if (_net) UnhookSessionCallbacks();
 
         ReturnToMainOnly();
     }
@@ -463,15 +457,7 @@ public class MatchManager : MonoBehaviour
 
     private IEnumerator MatchSequence(HashSet<ulong> hunterIds)
     {
-        var sm = _net.SceneManager;
-
-        // Strictly serialized: NGO allows only one scene op in flight at a time.
-        Scene lobby = SceneManager.GetSceneByName(lobbySceneName);
-        if (lobby.IsValid() && lobby.isLoaded)
-            yield return SceneOp(() => sm.UnloadScene(lobby), SceneEventType.UnloadEventCompleted, lobbySceneName);
-
-        yield return SceneOp(() => sm.LoadScene(matchSceneName, LoadSceneMode.Additive),
-                             SceneEventType.LoadEventCompleted, matchSceneName);
+        yield return SwapScenes(lobbySceneName, matchSceneName);
 
         RespawnAll(id => hunterIds.Contains(id) ? hunterPrefab : hiderPrefab, matchSpawnCenter);
 
@@ -500,7 +486,7 @@ public class MatchManager : MonoBehaviour
         yield return WaitPhase(resolveDuration, null);
 
         _phaseRoutine = null;
-        EndMatch(); // swaps the map back to the lobby and respawns everyone as the neutral Player
+        EndMatch();
     }
 
     // Waits up to 'seconds' of server real time, returning early the moment 'until' (if supplied) is true.
@@ -691,15 +677,7 @@ public class MatchManager : MonoBehaviour
 
     private IEnumerator EndMatchSequence()
     {
-        var sm = _net.SceneManager;
-
-        // Strictly serialized: NGO allows only one scene op in flight at a time.
-        Scene map = SceneManager.GetSceneByName(matchSceneName);
-        if (map.IsValid() && map.isLoaded)
-            yield return SceneOp(() => sm.UnloadScene(map), SceneEventType.UnloadEventCompleted, matchSceneName);
-
-        yield return SceneOp(() => sm.LoadScene(lobbySceneName, LoadSceneMode.Additive),
-                             SceneEventType.LoadEventCompleted, lobbySceneName);
+        yield return SwapScenes(matchSceneName, lobbySceneName);
 
         RespawnAll(_ => _playerPrefab, lobbySpawnCenter);
 
@@ -707,6 +685,20 @@ public class MatchManager : MonoBehaviour
         Debug.Log("[MatchManager] Back in lobby.", this);
     }
 
+    // Unloads one gameplay scene (if loaded), then additively loads the next (shared by the match
+    // start/end sequences).
+    private IEnumerator SwapScenes(string unloadSceneName, string loadSceneName)
+    {
+        var sm = _net.SceneManager;
+
+        Scene old = SceneManager.GetSceneByName(unloadSceneName);
+        if (old.IsValid() && old.isLoaded)
+            yield return SceneOp(() => sm.UnloadScene(old), SceneEventType.UnloadEventCompleted, unloadSceneName);
+
+        yield return SceneOp(() => sm.LoadScene(loadSceneName, LoadSceneMode.Additive),
+                             SceneEventType.LoadEventCompleted, loadSceneName);
+    }
+
     // Runs an NGO scene op and waits for its server-side completion event. NGO rejects a new op while one
     // is in flight, so callers must await this before issuing the next.
     private IEnumerator SceneOp(System.Func<SceneEventProgressStatus> op, SceneEventType completed, string sceneName)
@@ -823,18 +815,22 @@ public class MatchManager : MonoBehaviour
     public bool IsLocalSceneLobby => SceneManager.GetActiveScene().name == lobbySceneName;
     public bool IsLocalSceneMap   => SceneManager.GetActiveScene().name == matchSceneName;
 
-    // Server -> client: tell the designated client it is the match authority (so it reads Esc locally).
-    private void SendAuthorityGrant(ulong clientId)
+    // Sends a named message whose payload carries no information (a named message still needs a buffer,
+    // so a single dummy byte is written).
+    private void SendEmptyNamedMessage(string messageName, ulong targetClientId)
     {
         var cmm = _net != null ? _net.CustomMessagingManager : null;
         if (cmm == null) return;
         using (var writer = new FastBufferWriter(sizeof(byte), Allocator.Temp))
         {
-            writer.WriteByteSafe(1); // payload unused; a named message still needs a buffer
-            cmm.SendNamedMessage(MsgAuthorityGranted, clientId, writer);
+            writer.WriteByteSafe(1);
+            cmm.SendNamedMessage(messageName, targetClientId, writer);
         }
     }
 
+    // Server -> client: tell the designated client it is the match authority (so it reads Esc locally).
+    private void SendAuthorityGrant(ulong clientId) => SendEmptyNamedMessage(MsgAuthorityGranted, clientId);
+
     // Client handler: this machine has been granted match authority.
     private void OnAuthorityGrantedMessage(ulong senderClientId, FastBufferReader reader)
     {
@@ -844,16 +840,7 @@ public class MatchManager : MonoBehaviour
 
     // Client -> server: ask the server to end the match. Only honored from the authority client (and only
     // while a match is running - EndMatch guards the phase).
-    private void RequestEndMatchFromServer()
-    {
-        var cmm = _net != null ? _net.CustomMessagingManager : null;
-        if (cmm == null) return;
-        using (var writer = new FastBufferWriter(sizeof(byte), Allocator.Temp))
-        {
-            writer.WriteByteSafe(1);
-            cmm.SendNamedMessage(MsgRequestEndMatch, NetworkManager.ServerClientId, writer);
-        }
-    }
+    private void RequestEndMatchFromServer() => SendEmptyNamedMessage(MsgRequestEndMatch, NetworkManager.ServerClientId);
 
     // Server handler: an authority client asked to end the match.
     private void OnRequestEndMatchMessage(ulong senderClientId, FastBufferReader reader)