write directory for temp

tools.py

@@ -72,7 +72,8 @@ def write_bytes_to_temp_dir(file_bytes: bytes, file_name: str) -> str:
     Returns the full path to the saved file.
     The file will persist until manually deleted or the OS cleans the temp directory.
     """
-    temp_dir = tempfile.gettempdir()
+    temp_dir = "/tmp"  # /tmp is always writable in Hugging Face Spaces
+    os.makedirs(temp_dir, exist_ok=True)
     file_path = os.path.join(temp_dir, file_name)
     with open(file_path, 'wb') as f:
         f.write(file_bytes)