fix: type error

debug.py

@@ -29,7 +29,7 @@ scheduler = CommitScheduler(
 )
 def save_image(image_id: str, image_array: np.ndarray) -> None:
     os.makedirs(IMAGE_DIR, exist_ok=True)
-    image_path = IMAGE_DIR / f"{image_id}.png"
+    image_path = os.path.join(IMAGE_DIR, f"{image_id}.png")
     with scheduler.lock:
         try:
             Image.fromarray(image_array).save(image_path)