feat(D-01/A): poseType, helpers, OWNERSHIP ComponentType (A4, A5, A6)

- DataDrivenItemDefinition: add poseType field, parsed from JSON "pose_type"
- PoseTypeHelper: resolves PoseType from V2 definition or V1 ItemBind fallback
- BindModeHelper: static bind mode NBT utilities (isBindItem, hasArmsBound,
  hasLegsBound, cycleBindModeId) — works for V1 and V2 items
- CollarHelper: complete static utility class for collar operations with
  dual-path V2/V1 dispatch (ownership, features, shock, GPS, choke, alert)
- ComponentType: add OWNERSHIP enum value
- OwnershipComponent: stub class (lifecycle hooks added in next commit)

src/main/java/com/tiedup/remake/v2/bondage/BindModeHelper.java

@@ -0,0 +1,95 @@
+package com.tiedup.remake.v2.bondage;
+
+import com.tiedup.remake.items.base.ItemBind;
+import com.tiedup.remake.v2.BodyRegionV2;
+import com.tiedup.remake.v2.bondage.datadriven.DataDrivenItemDefinition;
+import com.tiedup.remake.v2.bondage.datadriven.DataDrivenItemRegistry;
+import java.util.Map;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.item.ItemStack;
+
+/**
+ * Static utilities for bind mode operations on any bondage item stack (V1 or V2).
+ *
+ * <p>Bind mode determines whether a bind restrains arms, legs, or both.
+ * The mode is stored in the stack's NBT tag {@code "bindMode"}.</p>
+ */
+public final class BindModeHelper {
+
+    private BindModeHelper() {}
+
+    private static final String NBT_BIND_MODE = "bindMode";
+
+    public static final String MODE_FULL = "full";
+    public static final String MODE_ARMS = "arms";
+    public static final String MODE_LEGS = "legs";
+
+    private static final String[] MODE_CYCLE = { MODE_FULL, MODE_ARMS, MODE_LEGS };
+
+    private static final Map<String, String> MODE_TRANSLATION_KEYS = Map.of(
+        MODE_FULL, "tiedup.bindmode.full",
+        MODE_ARMS, "tiedup.bindmode.arms",
+        MODE_LEGS, "tiedup.bindmode.legs"
+    );
+
+    /**
+     * Check if the given stack is a bind item (V2 ARMS-region item or V1 ItemBind).
+     */
+    public static boolean isBindItem(ItemStack stack) {
+        if (stack.isEmpty()) return false;
+        // V2: check data-driven definition
+        DataDrivenItemDefinition def = DataDrivenItemRegistry.get(stack);
+        if (def != null) {
+            return def.occupiedRegions().contains(BodyRegionV2.ARMS);
+        }
+        // V1 fallback
+        return stack.getItem() instanceof ItemBind;
+    }
+
+    /**
+     * Get the bind mode ID from the stack's NBT.
+     * @return "full", "arms", or "legs" (defaults to "full")
+     */
+    public static String getBindModeId(ItemStack stack) {
+        if (stack.isEmpty()) return MODE_FULL;
+        CompoundTag tag = stack.getTag();
+        if (tag == null || !tag.contains(NBT_BIND_MODE)) return MODE_FULL;
+        String value = tag.getString(NBT_BIND_MODE);
+        if (MODE_ARMS.equals(value) || MODE_LEGS.equals(value)) return value;
+        return MODE_FULL;
+    }
+
+    /** True if arms are restrained (mode is "arms" or "full"). */
+    public static boolean hasArmsBound(ItemStack stack) {
+        String mode = getBindModeId(stack);
+        return MODE_ARMS.equals(mode) || MODE_FULL.equals(mode);
+    }
+
+    /** True if legs are restrained (mode is "legs" or "full"). */
+    public static boolean hasLegsBound(ItemStack stack) {
+        String mode = getBindModeId(stack);
+        return MODE_LEGS.equals(mode) || MODE_FULL.equals(mode);
+    }
+
+    /**
+     * Cycle bind mode: full → arms → legs → full.
+     * @return the new mode ID
+     */
+    public static String cycleBindModeId(ItemStack stack) {
+        String current = getBindModeId(stack);
+        String next = MODE_FULL;
+        for (int i = 0; i < MODE_CYCLE.length; i++) {
+            if (MODE_CYCLE[i].equals(current)) {
+                next = MODE_CYCLE[(i + 1) % MODE_CYCLE.length];
+                break;
+            }
+        }
+        stack.getOrCreateTag().putString(NBT_BIND_MODE, next);
+        return next;
+    }
+
+    /** Get the translation key for the current bind mode. */
+    public static String getBindModeTranslationKey(ItemStack stack) {
+        return MODE_TRANSLATION_KEYS.getOrDefault(getBindModeId(stack), "tiedup.bindmode.full");
+    }
+}