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/FurnitureDefinition.java

@@ -0,0 +1,103 @@
+package com.tiedup.remake.v2.furniture;
+
+import java.util.List;
+import java.util.Map;
+import net.minecraft.resources.ResourceLocation;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Immutable definition for a data-driven furniture piece.
+ *
+ * <p>Loaded from JSON files in {@code data/<namespace>/tiedup_furniture/}.
+ * Synced to clients via {@code PacketSyncFurnitureDefinitions}.
+ * Each definition describes placement rules, visual properties,
+ * seat layout, and interaction feedback for a furniture type.</p>
+ *
+ * <p>All rendering and gameplay properties are read from this record at runtime
+ * via the furniture entity and renderer.</p>
+ */
+public record FurnitureDefinition(
+    /** Unique identifier (e.g., "tiedup:wooden_stocks"). */
+    ResourceLocation id,
+
+    /** Human-readable display name (fallback if no translation key). */
+    String displayName,
+
+    /** Optional translation key for localized display name. */
+    @Nullable String translationKey,
+
+    /** Resource location of the GLB model file. */
+    ResourceLocation modelLocation,
+
+    /** Tint channel defaults: channel name to ARGB color (e.g., "tintable_0" -> 0x8B4513). */
+    Map<String, Integer> tintChannels,
+
+    /** Whether this furniture supports player-applied color customization. */
+    boolean supportsColor,
+
+    /** Collision box width in blocks (X/Z axis). */
+    float hitboxWidth,
+
+    /** Collision box height in blocks (Y axis). */
+    float hitboxHeight,
+
+    /** Whether this furniture snaps to adjacent walls on placement. */
+    boolean snapToWall,
+
+    /** Whether this furniture can only be placed on solid ground. */
+    boolean floorOnly,
+
+    /** Whether this furniture can be locked with a key item. */
+    boolean lockable,
+
+    /** Resistance to breaking (higher = harder to destroy). */
+    float breakResistance,
+
+    /** Whether the furniture drops as an item when broken. */
+    boolean dropOnBreak,
+
+    /** Ordered list of seat definitions. Index is used for bitmask operations. */
+    List<SeatDefinition> seats,
+
+    /** Optional sound overrides for interactions. */
+    FurnitureFeedback feedback,
+
+    /** Grouping category for creative menu / UI filtering (e.g., "restraint", "decoration"). */
+    String category,
+
+    /**
+     * Optional inventory icon model location (e.g., "tiedup:item/wooden_stocks").
+     *
+     * <p>Points to a standard {@code item/generated} model JSON that will be used
+     * as the inventory sprite for this furniture variant when held as a placer item.
+     * When null, the default {@code tiedup:item/furniture_placer} model is used.</p>
+     */
+    @Nullable ResourceLocation icon
+) {
+    /**
+     * Find a seat definition by its unique ID.
+     *
+     * @param seatId the seat identifier to search for
+     * @return the matching {@link SeatDefinition}, or null if not found
+     */
+    @Nullable
+    public SeatDefinition getSeat(String seatId) {
+        for (SeatDefinition seat : seats) {
+            if (seat.id().equals(seatId)) return seat;
+        }
+        return null;
+    }
+
+    /**
+     * Get the positional index of a seat (for bitmask operations on lock state, occupancy, etc.).
+     *
+     * @param seatId the seat identifier to search for
+     * @return the zero-based index, or -1 if not found
+     */
+    public int getSeatIndex(String seatId) {
+        for (int i = 0; i < seats.size(); i++) {
+            if (seats.get(i).id().equals(seatId)) return i;
+        }
+        return -1;
+    }
+}