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/items/bondage3d/Model3DConfig.java

@@ -0,0 +1,67 @@
+package com.tiedup.remake.items.bondage3d;
+
+import java.util.Set;
+
+/**
+ * Configuration immutable for a 3D item.
+ * Contains all parameters necessary for rendering.
+ */
+public record Model3DConfig(
+    String objPath, // "tiedup:models/obj/ball_gag/model.obj"
+    String texturePath, // "tiedup:models/obj/ball_gag/texture.png" (or null = use MTL)
+    float posOffsetX, // Horizontal offset
+    float posOffsetY, // Vertical offset (negative = lower)
+    float posOffsetZ, // Depth offset (positive = forward)
+    float scale, // Scale (1.0 = normal size)
+    float rotOffsetX, // Additional X rotation
+    float rotOffsetY, // Additional Y rotation
+    float rotOffsetZ, // Additional Z rotation
+    Set<String> tintMaterials // Material names to apply color tint (e.g., "Ball")
+) {
+    /** Config without tinting */
+    public static Model3DConfig simple(String objPath, String texturePath) {
+        return new Model3DConfig(
+            objPath,
+            texturePath,
+            0,
+            0,
+            0,
+            1.0f,
+            0,
+            0,
+            0,
+            Set.of()
+        );
+    }
+
+    /** Config with position/rotation but no tinting */
+    public Model3DConfig(
+        String objPath,
+        String texturePath,
+        float posOffsetX,
+        float posOffsetY,
+        float posOffsetZ,
+        float scale,
+        float rotOffsetX,
+        float rotOffsetY,
+        float rotOffsetZ
+    ) {
+        this(
+            objPath,
+            texturePath,
+            posOffsetX,
+            posOffsetY,
+            posOffsetZ,
+            scale,
+            rotOffsetX,
+            rotOffsetY,
+            rotOffsetZ,
+            Set.of()
+        );
+    }
+
+    /** Check if this item supports color tinting */
+    public boolean supportsTinting() {
+        return tintMaterials != null && !tintMaterials.isEmpty();
+    }
+}