feat(D-01/A): OwnershipComponent lifecycle hooks (A7)

- onEquipped: register collar owners in CollarRegistry (server-side only)
- onUnequipped: alert kidnappers + unregister from CollarRegistry
- Guards: client-side check, ServerLevel cast, empty owners skip, try-catch
- appendTooltip: nickname, owner count, shock/GPS/choke capabilities
- Delegates alert suppression to ItemCollar.isRemovalAlertSuppressed()

src/main/java/com/tiedup/remake/v2/bondage/component/OwnershipComponent.java

@@ -1,6 +1,21 @@
 package com.tiedup.remake.v2.bondage.component;
 
 import com.google.gson.JsonObject;
+import com.tiedup.remake.core.TiedUpMod;
+import com.tiedup.remake.items.base.ItemCollar;
+import com.tiedup.remake.state.CollarRegistry;
+import com.tiedup.remake.v2.bondage.CollarHelper;
+import java.util.HashSet;
+import java.util.List;
+import java.util.UUID;
+import net.minecraft.ChatFormatting;
+import net.minecraft.network.chat.Component;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.item.ItemStack;
+import net.minecraft.world.item.TooltipFlag;
+import net.minecraft.world.level.Level;
+import org.jetbrains.annotations.Nullable;
 
 /**
  * Component: collar ownership behavior for data-driven items.
@@ -17,4 +32,88 @@ public class OwnershipComponent implements IItemComponent {
     public static IItemComponent fromJson(JsonObject config) {
         return new OwnershipComponent();
     }
+
+    @Override
+    public void onEquipped(ItemStack stack, LivingEntity entity) {
+        if (entity.level().isClientSide()) return;
+        if (!(entity.level() instanceof ServerLevel serverLevel)) return;
+
+        List<UUID> owners = CollarHelper.getOwners(stack);
+        if (owners.isEmpty()) {
+            TiedUpMod.LOGGER.debug(
+                "[OwnershipComponent] Collar equipped on {} with no owners in NBT — skipping registry",
+                entity.getName().getString()
+            );
+            return;
+        }
+
+        try {
+            CollarRegistry registry = CollarRegistry.get(serverLevel);
+            registry.registerCollar(entity.getUUID(), new HashSet<>(owners));
+            TiedUpMod.LOGGER.debug(
+                "[OwnershipComponent] Registered collar for {} with {} owner(s)",
+                entity.getName().getString(), owners.size()
+            );
+        } catch (Exception e) {
+            TiedUpMod.LOGGER.warn(
+                "[OwnershipComponent] Failed to register collar for {}: {}",
+                entity.getName().getString(), e.getMessage()
+            );
+        }
+    }
+
+    @Override
+    public void onUnequipped(ItemStack stack, LivingEntity entity) {
+        if (entity.level().isClientSide()) return;
+        if (!(entity.level() instanceof ServerLevel serverLevel)) return;
+
+        // Alert kidnappers if removal wasn't suppressed
+        if (!CollarHelper.isRemovalAlertSuppressed()) {
+            ItemCollar.onCollarRemoved(entity, true);
+        }
+
+        try {
+            CollarRegistry registry = CollarRegistry.get(serverLevel);
+            registry.unregisterWearer(entity.getUUID());
+            TiedUpMod.LOGGER.debug(
+                "[OwnershipComponent] Unregistered collar for {}",
+                entity.getName().getString()
+            );
+        } catch (Exception e) {
+            TiedUpMod.LOGGER.warn(
+                "[OwnershipComponent] Failed to unregister collar for {}: {}",
+                entity.getName().getString(), e.getMessage()
+            );
+        }
+    }
+
+    @Override
+    public void appendTooltip(ItemStack stack, @Nullable Level level, List<Component> tooltip, TooltipFlag flag) {
+        String nickname = CollarHelper.getNickname(stack);
+        if (nickname != null && !nickname.isEmpty()) {
+            tooltip.add(Component.translatable("item.tiedup.tooltip.nickname", nickname)
+                .withStyle(ChatFormatting.LIGHT_PURPLE));
+        }
+
+        List<UUID> owners = CollarHelper.getOwners(stack);
+        if (!owners.isEmpty()) {
+            tooltip.add(Component.translatable("item.tiedup.tooltip.owners", owners.size())
+                .withStyle(ChatFormatting.GOLD));
+        }
+
+        if (CollarHelper.canShock(stack)) {
+            tooltip.add(Component.translatable("item.tiedup.tooltip.shock_capable")
+                .withStyle(ChatFormatting.DARK_RED));
+        }
+
+        if (CollarHelper.hasGPS(stack)) {
+            tooltip.add(Component.translatable("item.tiedup.tooltip.gps_capable")
+                .withStyle(ChatFormatting.AQUA));
+        }
+
+        if (CollarHelper.isChokeCollar(stack)) {
+            tooltip.add(Component.translatable("item.tiedup.tooltip.choke_capable")
+                .withStyle(ChatFormatting.DARK_PURPLE));
+        }
+    }
 }