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/PlayerPoseController.cs

@@ -179,7 +179,7 @@ public class PlayerPoseController : MonoBehaviour
         // Local control only - a remote's pose index is pushed in via SetNetworkState.
         if (!_networkControlled)
         {
-            if (CycleKeyPressed())
+            if (InputUtil.GameplayKeyPressed(cycleKey))
                 NextPose();
 
             // Sprinting in any state (ground, air, wall, ceiling) snaps the selection back to the default
@@ -213,17 +213,21 @@ public class PlayerPoseController : MonoBehaviour
         // Camera target: a per-pose framing offset (applied in any state), eased so cycling poses glides
         // the camera, routed to the ThirdPersonCamera's follow target only (never the body).
         float cameraPoseTarget = pose ? pose.CameraTargetYOffset : 0f;
-        _cameraPoseOffset = cameraOffsetSpeed > 0f
-            ? Mathf.MoveTowards(_cameraPoseOffset, cameraPoseTarget, cameraOffsetSpeed * Time.deltaTime)
-            : cameraPoseTarget;
+        _cameraPoseOffset = EaseCameraOffset(_cameraPoseOffset, cameraPoseTarget);
         _player.SetCameraTargetLocalYOffset(_cameraPoseOffset);
 
         // Separate per-pose first-person eye offset - NOT routed to the shared camera target (that would
         // also move the ThirdPersonCamera); the FirstPersonController reads it directly.
         float firstPersonTarget = pose ? pose.FirstPersonCameraTargetYOffset : 0f;
-        _firstPersonCameraOffset = cameraOffsetSpeed > 0f
-            ? Mathf.MoveTowards(_firstPersonCameraOffset, firstPersonTarget, cameraOffsetSpeed * Time.deltaTime)
-            : firstPersonTarget;
+        _firstPersonCameraOffset = EaseCameraOffset(_firstPersonCameraOffset, firstPersonTarget);
+    }
+
+    /// <summary>Eases a camera y-offset toward its target at <see cref="cameraOffsetSpeed"/>; 0 snaps.</summary>
+    private float EaseCameraOffset(float current, float target)
+    {
+        return cameraOffsetSpeed > 0f
+            ? Mathf.MoveTowards(current, target, cameraOffsetSpeed * Time.deltaTime)
+            : target;
     }
 
     void OnDisable()
@@ -339,17 +343,6 @@ public class PlayerPoseController : MonoBehaviour
         _player.SetCapsule(_capCenterY, _capRadius, _capHeight);
     }
 
-    private bool CycleKeyPressed()
-    {
-        if (TypingGuard.IsTyping) return false;
-#if ENABLE_INPUT_SYSTEM
-        var keyboard = Keyboard.current;
-        return keyboard != null && keyboard[cycleKey].wasPressedThisFrame;
-#else
-        return Input.GetKeyDown(cycleKey);
-#endif
-    }
-
     /// <summary>
     /// Plays and holds the given clip, overriding the Animator Controller. Switching to a different
     /// clip crossfades from the current pose over <see cref="poseBlendDuration"/> (the first pose, or a