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/TrapBlockEntity.java

@@ -0,0 +1,28 @@
+package com.tiedup.remake.blocks.entity;
+
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.block.state.BlockState;
+
+/**
+ * BlockEntity for rope trap blocks.
+ *
+ * Phase 16: Blocks
+ *
+ * Stores bondage items that will be applied when an entity walks on the trap.
+ * Simple extension of BondageItemBlockEntity.
+ *
+ * Based on original TileEntityTrap from 1.12.2
+ */
+public class TrapBlockEntity extends BondageItemBlockEntity {
+
+    public TrapBlockEntity(BlockPos pos, BlockState state) {
+        super(ModBlockEntities.TRAP.get(), pos, state);
+    }
+
+    /**
+     * Constructor with off-mode for tooltip reading.
+     */
+    public TrapBlockEntity(BlockPos pos, BlockState state, boolean offMode) {
+        super(ModBlockEntities.TRAP.get(), pos, state, offMode);
+    }
+}