fix(D-01/A): 3 review bugs + null guards (BUG-001, BUG-002, BUG-003, RISK-003)

BUG-001: TyingInteractionHelper swap now checks V2EquipResult — on failure,
rolls back by re-equipping the old bind instead of leaving target untied

BUG-002: OwnershipComponent.onUnequipped no longer double-calls
unregisterWearer — onCollarRemoved already handles it. Suppressed-alert
path calls unregister directly since onCollarRemoved is skipped.

BUG-003: PacketSelfBondage handleV2SelfBind now clears completed tying
task from PlayerBindState to prevent blocking future tying interactions

RISK-003: StruggleCollar get/setResistanceState null-guard on player

src/main/java/com/tiedup/remake/network/selfbondage/PacketSelfBondage.java

@@ -291,6 +291,12 @@ public class PacketSelfBondage {
         if (playerState.getCurrentTyingTask() == newTask) {
             newTask.update();
         }
+
+        // Clear completed task to prevent blocking future tying interactions
+        TyingTask activeTask = playerState.getCurrentTyingTask();
+        if (activeTask != null && activeTask.isStopped()) {
+            playerState.setCurrentTyingTask(null);
+        }
     }
 
     private static void handleV2SelfAccessory(