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/client/animation/AnimationStateRegistry.java

@@ -0,0 +1,60 @@
+package com.tiedup.remake.client.animation;
+
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import net.minecraftforge.api.distmarker.Dist;
+import net.minecraftforge.api.distmarker.OnlyIn;
+
+/**
+ * Central registry for player animation state tracking.
+ *
+ * <p>Holds per-player state maps that were previously scattered across
+ * AnimationTickHandler. Provides a single clearAll() entry point for
+ * world unload cleanup.
+ */
+@OnlyIn(Dist.CLIENT)
+public final class AnimationStateRegistry {
+
+    /** Track last tied state per player */
+    static final Map<UUID, Boolean> lastTiedState = new ConcurrentHashMap<>();
+
+    /** Track last animation ID per player to avoid redundant updates */
+    static final Map<UUID, String> lastAnimId = new ConcurrentHashMap<>();
+
+    private AnimationStateRegistry() {}
+
+    public static Map<UUID, Boolean> getLastTiedState() {
+        return lastTiedState;
+    }
+
+    public static Map<UUID, String> getLastAnimId() {
+        return lastAnimId;
+    }
+
+    /**
+     * Clear all animation-related state in one call.
+     * Called on world unload to prevent memory leaks and stale data.
+     */
+    public static void clearAll() {
+        // Animation state tracking
+        lastTiedState.clear();
+        lastAnimId.clear();
+
+        // Animation managers
+        BondageAnimationManager.clearAll();
+        PendingAnimationManager.clearAll();
+
+        // V2 animation context system (clearAll chains to ContextAnimationFactory.clearCache)
+        com.tiedup.remake.client.gltf.GltfAnimationApplier.clearAll();
+
+        // Render state
+        com.tiedup.remake.client.animation.render.DogPoseRenderHandler.clearState();
+
+        // NPC animation state
+        com.tiedup.remake.client.animation.tick.NpcAnimationTickHandler.clearAll();
+
+        // MCA animation cache
+        com.tiedup.remake.client.animation.tick.MCAAnimationTickCache.clear();
+    }
+}