Error handlers in execute_task, fix_skill, and upload_skill returned
traceback.format_exc() to MCP clients, exposing internal file paths,
code structure, and potentially sensitive details. The full traceback
is already logged server-side via logger.error(exc_info=True).
Remove the traceback field from client-facing error responses and
clean up the unused traceback import.
Closes#19
Made-with: Cursor