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/v2/furniture/FurnitureFeedback.java

@@ -0,0 +1,36 @@
+package com.tiedup.remake.v2.furniture;
+
+import net.minecraft.resources.ResourceLocation;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Sound events for furniture interactions. All fields are optional
+ * -- null means "use the default sound" at runtime.
+ *
+ * <p>Loaded from the {@code "feedback"} block of a furniture JSON definition.
+ * When the entire block is absent, {@link #EMPTY} is used.</p>
+ */
+public record FurnitureFeedback(
+    /** Sound played when a player mounts the furniture. */
+    @Nullable ResourceLocation mountSound,
+
+    /** Sound played when a seat is locked. */
+    @Nullable ResourceLocation lockSound,
+
+    /** Sound played when a seat is unlocked. */
+    @Nullable ResourceLocation unlockSound,
+
+    /** Looping sound played while a player struggles in a locked seat. */
+    @Nullable ResourceLocation struggleLoopSound,
+
+    /** Sound played on successful escape. */
+    @Nullable ResourceLocation escapeSound,
+
+    /** Sound played when an action is denied (e.g., locked seat interaction). */
+    @Nullable ResourceLocation deniedSound
+) {
+    /** Empty feedback -- all sounds null (use defaults). */
+    public static final FurnitureFeedback EMPTY = new FurnitureFeedback(
+        null, null, null, null, null, null
+    );
+}