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/blocks/entity/IBondageItemHolder.java

@@ -0,0 +1,91 @@
+package com.tiedup.remake.blocks.entity;
+
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.item.ItemStack;
+
+/**
+ * Interface for BlockEntities that store bondage items.
+ *
+ * Phase 16: Blocks
+ *
+ * Defines the contract for storing and retrieving bondage items:
+ * - Bind (ropes, chains, etc.)
+ * - Gag
+ * - Blindfold
+ * - Earplugs
+ * - Collar
+ * - Clothes
+ *
+ * Based on original ITileEntityBondageItemHolder from 1.12.2
+ */
+public interface IBondageItemHolder {
+    // ========================================
+    // BIND
+    // ========================================
+
+    ItemStack getBind();
+    void setBind(ItemStack bind);
+
+    // ========================================
+    // GAG
+    // ========================================
+
+    ItemStack getGag();
+    void setGag(ItemStack gag);
+
+    // ========================================
+    // BLINDFOLD
+    // ========================================
+
+    ItemStack getBlindfold();
+    void setBlindfold(ItemStack blindfold);
+
+    // ========================================
+    // EARPLUGS
+    // ========================================
+
+    ItemStack getEarplugs();
+    void setEarplugs(ItemStack earplugs);
+
+    // ========================================
+    // COLLAR
+    // ========================================
+
+    ItemStack getCollar();
+    void setCollar(ItemStack collar);
+
+    // ========================================
+    // CLOTHES
+    // ========================================
+
+    ItemStack getClothes();
+    void setClothes(ItemStack clothes);
+
+    // ========================================
+    // NBT SERIALIZATION
+    // ========================================
+
+    /**
+     * Read bondage items from NBT.
+     * @param tag The compound tag to read from
+     */
+    void readBondageData(CompoundTag tag);
+
+    /**
+     * Write bondage items to NBT.
+     * @param tag The compound tag to write to
+     * @return The modified compound tag
+     */
+    CompoundTag writeBondageData(CompoundTag tag);
+
+    // ========================================
+    // STATE
+    // ========================================
+
+    /**
+     * Check if this holder has any bondage items loaded.
+     * Typically checks if bind is present.
+     * @return true if armed/loaded
+     */
+    boolean isArmed();
+}