Audit-1 review : fix stale '6 ticks' comment + track NONE_MASK null

Reviewer flagged two MEDIUM cosmetic items :
- SMELL-001 : TiedUpAnimationRegistry:97 comment still said '6 ticks' —
  updated to '0.15s = 3 ticks' to match the new constant.
- SMELL-002 : JointMaskReloadListener.getNoneMask() can still return
  null if a resource pack omits tiedup:none. Call sites tolerate null
  today; logged in PHASE0_DEGRADATIONS for a Phase 3 fallback JSON +
  warn log.

src/main/java/com/tiedup/remake/rig/TiedUpAnimationRegistry.java

@@ -94,7 +94,7 @@ public final class TiedUpAnimationRegistry {
         }
 
         try {
-            // transitionTime=GENERAL (6 ticks) + isRepeat=true + registryName +
+            // transitionTime=GENERAL (0.15s = 3 ticks) + isRepeat=true + registryName +
             // armature=BIPED. L'ordre match le ctor DirectStaticAnimation(float, boolean, ResourceLocation, AssetAccessor).
             CONTEXT_STAND_IDLE = new DirectStaticAnimation(
                 TiedUpRigConstants.GENERAL_ANIMATION_TRANSITION_TIME,