fix(runtime): address review feedback on retry and cleanup

nanobot/utils/helpers.py

@@ -11,6 +11,7 @@ from pathlib import Path
 from typing import Any
 
 import tiktoken
+from loguru import logger
 
 
 def strip_think(text: str) -> str:
@@ -214,8 +215,8 @@ def maybe_persist_tool_result(
     bucket = ensure_dir(root / safe_filename(session_key or "default"))
     try:
         _cleanup_tool_result_buckets(root, bucket)
-    except Exception:
-        pass
+    except Exception as exc:
+        logger.warning("Failed to clean stale tool result buckets in {}: {}", root, exc)
     path = bucket / f"{safe_filename(tool_call_id)}.{suffix}"
     if not path.exists():
         if suffix == "json" and isinstance(content, list):