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/ICanBeLoaded.java

@@ -0,0 +1,17 @@
+package com.tiedup.remake.blocks;
+
+/**
+ * Marker interface for blocks that can have bondage items loaded into them.
+ *
+ * Phase 16: Blocks
+ *
+ * Implemented by:
+ * - BlockRopesTrap - applies items when entity walks on it
+ * - BlockTrappedBed - applies items when player sleeps
+ * - BlockKidnapBomb - passes items to explosion entity
+ *
+ * These blocks have associated BlockEntities that store the bondage items.
+ */
+public interface ICanBeLoaded {
+    // Marker interface - no methods required
+}