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/HsvColorPicker.cs

@@ -10,11 +10,10 @@ using UnityEngine.UI;
 /// edited separately by a standalone slider in the HUD, not by this picker; <see cref="SetColor"/>
 /// still stores the incoming alpha so <see cref="Value"/> round-trips it.
 ///
-/// <see cref="Build"/> creates the child structure (stable names, no sprites or hooks); it can
-/// be baked into a prefab. <see cref="Rebind"/> then (re)assigns the runtime gradient sprites
-/// (which a prefab cannot store) and (re)hooks the drag relays - it runs for both the code-built
-/// picker and one instantiated from a prefab, so the two are behaviourally identical. A leftover
-/// alpha bar from a pre-split prefab is hidden by <see cref="Rebind"/>, so no re-bake is required.
+/// The child structure (stable names) comes from the baked HUD prefab. <see cref="Rebind"/>
+/// (re)assigns the runtime gradient sprites (which a prefab cannot store) and (re)hooks the drag
+/// relays. A leftover alpha bar from a pre-split prefab is hidden by <see cref="Rebind"/>, so no
+/// re-bake is required.
 /// </summary>
 public class HsvColorPicker : MonoBehaviour
 {
@@ -24,9 +23,6 @@ public class HsvColorPicker : MonoBehaviour
 
     private float _h, _s, _v, _a = 1f;
 
-    // Gap between the stacked square / hue rows (matches the layout in Build).
-    private const float RowGap = 6f;
-
     private Image _hueBase;          // pure-hue background of the SV square
     private RectTransform _svHandle;
     private RectTransform _hueHandle;
@@ -51,46 +47,6 @@ public class HsvColorPicker : MonoBehaviour
         Refresh();
     }
 
-    /// <summary>
-    /// Builds the picker structure (square + hue bar + swatch) under this object,
-    /// top-left aligned. Layout only - no gradient sprites and no event hooks, so the result is
-    /// safe to bake into a prefab. Call <see cref="Rebind"/> afterwards (at runtime) to make it
-    /// functional.
-    /// </summary>
-    public void Build(float squareSize, float hueHeight)
-    {
-        // Saturation / value square: base hue + two named gradient overlays, top-left of this rect.
-        var sv = PaintHud.NewRect("SV", transform);
-        TopLeft(sv, new Vector2(0f, 0f), new Vector2(squareSize, squareSize));
-        PaintHud.AddImage(sv.gameObject, Color.red); // raycast target for the drag relay
-
-        PaintHud.AddOverlay(sv, "SatOverlay");
-        PaintHud.AddOverlay(sv, "ValOverlay");
-
-        sv.gameObject.AddComponent<UiPointerSurface>();
-
-        var svHandle = PaintHud.NewRect("Handle", sv);
-        svHandle.sizeDelta = new Vector2(12f, 12f);
-        PaintHud.AddImage(svHandle.gameObject, Color.white).raycastTarget = false;
-
-        // Hue bar below the square.
-        var hue = PaintHud.NewRect("Hue", transform);
-        TopLeft(hue, new Vector2(0f, -(squareSize + RowGap)), new Vector2(squareSize, hueHeight));
-        var hueImg = hue.gameObject.AddComponent<Image>();
-        hueImg.type = Image.Type.Simple;
-
-        hue.gameObject.AddComponent<UiPointerSurface>();
-
-        var hueHandle = PaintHud.NewRect("Handle", hue);
-        hueHandle.sizeDelta = new Vector2(4f, hueHeight + 4f);
-        PaintHud.AddImage(hueHandle.gameObject, Color.white).raycastTarget = false;
-
-        // Swatch, to the right of the square.
-        var sw = PaintHud.NewRect("Swatch", transform);
-        TopLeft(sw, new Vector2(squareSize + 10f, 0f), new Vector2(34f, 34f));
-        PaintHud.AddImage(sw.gameObject, Color.white).raycastTarget = false;
-    }
-
     /// <summary>
     /// Re-finds the child widgets, (re)assigns the runtime gradient sprites and (re)hooks the drag
     /// relays. Idempotent (unsubscribe-then-subscribe), so it is safe whether the structure was just
@@ -173,13 +129,4 @@ public class HsvColorPicker : MonoBehaviour
         }
         if (_swatch) _swatch.color = Color.HSVToRGB(_h, _s, _v);
     }
-
-    /// <summary>Anchors a child to this rect's top-left corner with the given offset and size.</summary>
-    private static void TopLeft(RectTransform rt, Vector2 offset, Vector2 size)
-    {
-        rt.anchorMin = rt.anchorMax = new Vector2(0f, 1f);
-        rt.pivot = new Vector2(0f, 1f);
-        rt.anchoredPosition = offset;
-        rt.sizeDelta = size;
-    }
 }