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/KidnapBombBlockEntity.java

@@ -0,0 +1,32 @@
+package com.tiedup.remake.blocks.entity;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.block.state.BlockState;
+
+/**
+ * BlockEntity for kidnap bomb blocks.
+ *
+ * Phase 16: Blocks
+ *
+ * Stores bondage items that will be applied when the bomb explodes.
+ * Simple extension of BondageItemBlockEntity.
+ *
+ * Based on original TileEntityKidnapBomb from 1.12.2
+ */
+public class KidnapBombBlockEntity extends BondageItemBlockEntity {
+
+    public KidnapBombBlockEntity(BlockPos pos, BlockState state) {
+        super(ModBlockEntities.KIDNAP_BOMB.get(), pos, state);
+    }
+
+    /**
+     * Constructor with off-mode for tooltip reading.
+     */
+    public KidnapBombBlockEntity(
+        BlockPos pos,
+        BlockState state,
+        boolean offMode
+    ) {
+        super(ModBlockEntities.KIDNAP_BOMB.get(), pos, state, offMode);
+    }
+}