feat(D-01/C): consumer migration — 85 files migrated to V2 helpers

Phase 1 (state): PlayerBindState, PlayerCaptorManager, PlayerEquipment,
  PlayerDataRetrieval, PlayerLifecycle, PlayerShockCollar, StruggleAccessory
Phase 2 (client): AnimationTickHandler, NpcAnimationTickHandler, 5 render
  handlers, DamselModel, 3 client mixins, SelfBondageInputHandler,
  SlaveManagementScreen, ActionPanel, SlaveEntryWidget, ModKeybindings
Phase 3 (entities): 28 entity/AI files migrated to CollarHelper,
  BindModeHelper, PoseTypeHelper, createStack()
Phase 4 (network): PacketSlaveAction, PacketMasterEquip,
  PacketAssignCellToCollar, PacketNpcCommand, PacketFurnitureForcemount
Phase 5 (events): RestraintTaskTickHandler, PetPlayRestrictionHandler,
  PlayerEnslavementHandler, ChatEventHandler, LaborAttackPunishmentHandler
Phase 6 (commands): BondageSubCommand, CollarCommand, NPCCommand,
  KidnapSetCommand
Phase 7 (compat): MCAKidnappedAdapter, MCA mixins
Phase 8 (misc): GagTalkManager, PetRequestManager, HangingCagePiece,
  BondageItemBlockEntity, TrappedChestBlockEntity, DispenserBehaviors,
  BondageItemLoaderUtility, RestraintApplicator, StruggleSessionManager,
  MovementStyleResolver, CampLifecycleManager

Some files retain dual V1/V2 checks (instanceof V1 || V2Helper) for
coexistence — V1-only branches removed in Branch D.

src/main/java/com/tiedup/remake/events/captivity/PlayerEnslavementHandler.java

@@ -3,8 +3,8 @@ package com.tiedup.remake.events.captivity;
 import com.tiedup.remake.core.SettingsAccessor;
 import com.tiedup.remake.core.TiedUpMod;
 import com.tiedup.remake.entities.LeashProxyEntity;
-import com.tiedup.remake.items.base.ItemCollar;
 import com.tiedup.remake.state.IBondageState;
+import com.tiedup.remake.v2.bondage.CollarHelper;
 import com.tiedup.remake.state.IPlayerLeashAccess;
 import com.tiedup.remake.state.PlayerBindState;
 import com.tiedup.remake.util.KidnappedHelper;
@@ -146,9 +146,9 @@ public class PlayerEnslavementHandler {
                     ItemStack collar = slaveKidnappedState.getEquipment(
                         BodyRegionV2.NECK
                     );
-                    if (collar.getItem() instanceof ItemCollar collarItem) {
+                    if (CollarHelper.isCollar(collar)) {
                         if (
-                            collarItem
+                            CollarHelper
                                 .getOwners(collar)
                                 .contains(master.getUUID())
                         ) {