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/v2/bondage/movement/MovementStyleResolver.java

@@ -1,7 +1,8 @@
 package com.tiedup.remake.v2.bondage.movement;
 
-import com.tiedup.remake.items.base.ItemBind;
 import com.tiedup.remake.items.base.PoseType;
+import com.tiedup.remake.v2.bondage.BindModeHelper;
+import com.tiedup.remake.v2.bondage.PoseTypeHelper;
 import com.tiedup.remake.v2.BodyRegionV2;
 import com.tiedup.remake.v2.bondage.datadriven.DataDrivenItemDefinition;
 import com.tiedup.remake.v2.bondage.datadriven.DataDrivenItemRegistry;
@@ -19,7 +20,7 @@ import org.jetbrains.annotations.Nullable;
  * default speed/jump values. Modifiers from lower-severity items are ignored.</p>
  *
  * <h3>V1 Compatibility (H6 fix)</h3>
- * <p>V1 items ({@link ItemBind}) stored in V2 capability
+ * <p>V1 items (ItemBind) stored in V2 capability
  * do not have data-driven definitions. This resolver provides a fallback that
  * maps V1 bind mode + pose type to a {@link MovementStyle} with speed values matching
  * the original V1 behavior, preventing double stacking between the legacy
@@ -122,7 +123,7 @@ public final class MovementStyleResolver {
     // ==================== V1 Fallback ====================
 
     /**
-     * Attempt to derive a movement style from a V1 {@link ItemBind} item.
+     * Attempt to derive a movement style from a V1 bind item.
      *
      * <p>Only items with legs bound produce a movement style. The mapping preserves
      * the original V1 speed values:</p>
@@ -137,15 +138,15 @@ public final class MovementStyleResolver {
      */
     @Nullable
     private static V1Fallback resolveV1Fallback(ItemStack stack) {
-        if (!(stack.getItem() instanceof ItemBind bindItem)) {
+        if (!BindModeHelper.isBindItem(stack)) {
             return null;
         }
 
-        if (!ItemBind.hasLegsBound(stack)) {
+        if (!BindModeHelper.hasLegsBound(stack)) {
             return null;
         }
 
-        PoseType poseType = bindItem.getPoseType();
+        PoseType poseType = PoseTypeHelper.getPoseType(stack);
 
         return switch (poseType) {
             case WRAP, LATEX_SACK -> new V1Fallback(

src/main/java/com/tiedup/remake/v2/furniture/network/PacketFurnitureForcemount.java

@@ -1,8 +1,8 @@
 package com.tiedup.remake.v2.furniture.network;
 
 import com.tiedup.remake.core.TiedUpMod;
-import com.tiedup.remake.items.base.ItemCollar;
 import com.tiedup.remake.network.PacketRateLimiter;
+import com.tiedup.remake.v2.bondage.CollarHelper;
 import com.tiedup.remake.state.IBondageState;
 import com.tiedup.remake.util.KidnappedHelper;
 import com.tiedup.remake.v2.BodyRegionV2;
@@ -28,7 +28,7 @@ import net.minecraftforge.network.NetworkEvent;
  * Client-to-server packet: master forces a captive onto a furniture seat.
  *
  * <p>The sender must own the captive's collar (verified via
- * {@link ItemCollar#isOwner(ItemStack, net.minecraft.world.entity.player.Player)}),
+ * {@link CollarHelper#isOwner(ItemStack, net.minecraft.world.entity.player.Player)}),
  * the captive must be alive and within 5 blocks of both sender and furniture,
  * and the furniture must have an available seat.</p>
  *
@@ -132,10 +132,7 @@ public class PacketFurnitureForcemount {
         }
 
         ItemStack collarStack = captiveState.getEquipment(BodyRegionV2.NECK);
-        if (
-            collarStack.isEmpty() ||
-            !(collarStack.getItem() instanceof ItemCollar collar)
-        ) {
+        if (!CollarHelper.isCollar(collarStack)) {
             TiedUpMod.LOGGER.debug(
                 "[PacketFurnitureForcemount] Invalid collar item on captive"
             );
@@ -143,7 +140,7 @@ public class PacketFurnitureForcemount {
         }
 
         // Collar must be owned by sender (or sender has admin permission)
-        if (!collar.isOwner(collarStack, sender) && !sender.hasPermissions(2)) {
+        if (!CollarHelper.isOwner(collarStack, sender) && !sender.hasPermissions(2)) {
             TiedUpMod.LOGGER.debug(
                 "[PacketFurnitureForcemount] {} is not the collar owner of {}",
                 sender.getName().getString(),