{
 "arm": "C",
 "contest": "qb",
 "model": "claude-opus-5.5",
 "harness": "copilot",
 "wall_seconds": 87.7,
 "exit_code": 0,
 "words": 726,
 "started": "2026-10-28T09:29:50",
 "stderr_tail": ""
}