fix: Auto-format base_backend.py and curator_response.py with ruff

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: madiator

src/bespokelabs/curator/code_executor/code_execution_backend/base_backend.py

@@ -654,4 +654,3 @@ async def append_execution_response(self, data: dict, filename: str) -> None:
         async with aiofiles.open(filename, "a") as f:
             await f.write(json_string + "\n")
         logger.debug(f"Successfully appended response to {filename}")
-

src/bespokelabs/curator/types/curator_response.py

@@ -366,4 +366,3 @@ def append(self, other: "CuratorResponse"):
         self.cost_info.add(other.cost_info)
         self.request_stats.add(other.request_stats)
         self.performance_stats.add(other.performance_stats)
-