Fix square bracket file name issue

gpt_engineer/chat_to_files.py

@@ -11,6 +11,9 @@ def parse_chat(chat):  # -> List[Tuple[str, str]]:
         # Strip the filename of any non-allowed characters and convert / to \
         path = re.sub(r'[<>"|?*]', "", match.group(1))
 
+        # Remove leading and trailing brackets
+        path = re.sub(r"^\[(.*)\]$", r"\1", path)
+
         # Get the code
         code = match.group(2)