Clean repo for open source release

Remove build artifacts, dev tool configs, unused dependencies,
and third-party source dumps. Add proper README, update .gitignore,
clean up Makefile.

src/main/java/com/tiedup/remake/entities/KidnapperCollarConfig.java

@@ -0,0 +1,167 @@
+package com.tiedup.remake.entities;
+
+import com.tiedup.remake.items.base.ItemCollar;
+import com.tiedup.remake.v2.BodyRegionV2;
+import com.tiedup.remake.util.teleport.Position;
+import java.util.List;
+import java.util.UUID;
+import org.jetbrains.annotations.Nullable;
+import net.minecraft.world.entity.LivingEntity;
+import net.minecraft.world.entity.player.Player;
+import net.minecraft.world.item.ItemStack;
+
+/**
+ * Helper class to access collar configuration for EntityKidnapper.
+ *
+ * <p>Provides null-safe accessors for collar settings like:
+ * <ul>
+ *   <li>Kidnapping mode state</li>
+ *   <li>Prison/Home positions</li>
+ *   <li>Blacklist/Whitelist filtering</li>
+ *   <li>Post-capture behavior flags</li>
+ * </ul>
+ *
+ * <p>This is a transient helper - not persisted to NBT.
+ */
+public class KidnapperCollarConfig {
+
+    private final EntityKidnapper kidnapper;
+
+    public KidnapperCollarConfig(EntityKidnapper kidnapper) {
+        this.kidnapper = kidnapper;
+    }
+
+    // ========================================
+    // COLLAR ITEM ACCESS
+    // ========================================
+
+    /**
+     * Get the collar item if equipped.
+     * @return ItemCollar or null if no collar or not an ItemCollar
+     */
+    @Nullable
+    public ItemCollar getCollarItem() {
+        ItemStack collar = kidnapper.getEquipment(BodyRegionV2.NECK);
+        if (collar.isEmpty()) return null;
+        if (collar.getItem() instanceof ItemCollar itemCollar) {
+            return itemCollar;
+        }
+        return null;
+    }
+
+    /**
+     * Get the collar ItemStack.
+     * @return The collar stack (may be empty)
+     */
+    public ItemStack getCollarStack() {
+        return kidnapper.getEquipment(BodyRegionV2.NECK);
+    }
+
+    // ========================================
+    // KIDNAPPING MODE
+    // ========================================
+
+    /**
+     * Check if kidnapping mode is enabled via collar.
+     */
+    public boolean isKidnappingModeEnabled() {
+        if (!kidnapper.hasCollar()) return false;
+
+        ItemCollar itemCollar = getCollarItem();
+        if (itemCollar == null) return false;
+
+        return itemCollar.isKidnappingModeEnabled(getCollarStack());
+    }
+
+    /**
+     * Check if kidnapping mode is fully ready (enabled + prison set).
+     */
+    public boolean isKidnappingModeReady() {
+        if (!kidnapper.hasCollar()) return false;
+
+        ItemCollar itemCollar = getCollarItem();
+        if (itemCollar == null) return false;
+
+        return itemCollar.isKidnappingModeReady(getCollarStack());
+    }
+
+    // ========================================
+    // POSITION GETTERS
+    // ========================================
+
+    /**
+     * Get cell ID from collar.
+     */
+    @Nullable
+    public java.util.UUID getCellId() {
+        ItemCollar itemCollar = getCollarItem();
+        if (itemCollar == null) return null;
+
+        return itemCollar.getCellId(getCollarStack());
+    }
+
+    /**
+     * Check if collar has a cell assigned.
+     */
+    public boolean hasCellAssigned() {
+        ItemCollar itemCollar = getCollarItem();
+        if (itemCollar == null) return false;
+
+        return itemCollar.hasCellAssigned(getCollarStack());
+    }
+
+    // ========================================
+    // BEHAVIOR FLAGS
+    // ========================================
+
+    /**
+     * Check if should warn masters after capturing slave.
+     */
+    public boolean shouldWarnMasters() {
+        ItemCollar itemCollar = getCollarItem();
+        if (itemCollar == null) return false;
+
+        return itemCollar.shouldWarnMasters(getCollarStack());
+    }
+
+    /**
+     * Check if should tie slave to pole in prison.
+     */
+    public boolean shouldTieToPole() {
+        ItemCollar itemCollar = getCollarItem();
+        if (itemCollar == null) return false;
+
+        return itemCollar.shouldTieToPole(getCollarStack());
+    }
+
+    // ========================================
+    // BLACKLIST/WHITELIST
+    // ========================================
+
+    /**
+     * Check if player is valid target for kidnapping mode.
+     * Uses collar blacklist/whitelist.
+     *
+     * <p>Logic:
+     * <ul>
+     *   <li>If whitelist is not empty, player MUST be on whitelist</li>
+     *   <li>Otherwise, player must NOT be on blacklist</li>
+     * </ul>
+     */
+    public boolean isValidKidnappingTarget(Player player) {
+        ItemCollar itemCollar = getCollarItem();
+        if (itemCollar == null) return true; // No collar config = everyone is valid
+
+        ItemStack collarStack = getCollarStack();
+        UUID playerUUID = player.getUUID();
+
+        // If whitelist exists and is not empty, player MUST be on it
+        List<UUID> whitelist = itemCollar.getWhitelist(collarStack);
+        if (!whitelist.isEmpty()) {
+            return whitelist.contains(playerUUID);
+        }
+
+        // Otherwise, check blacklist (blacklisted = not a valid target)
+        return !itemCollar.isBlacklisted(collarStack, playerUUID);
+    }
+}