{"note":"bim_versions 導入後の保存のみ記録 (それ以前は bim_canonical 上書きで履歴なし)","ok":true,"slug":"u-theoldmillhouse-mpq3q90q","versions":[{"created_at":"2026-06-10T23:05:55Z","element_count":85,"note":"legacy fix: jpy87379776→quote21237329 (旧世代データ是正・実験済u-house-890wnsao・rollback=m5:legacy_fix_rollback.jsonl)","saved_by":"mcp","sha256":"cf88855101c48debf54991f0463779a3101bf516e8d46f141c56c023f6eccc17","version":9},{"created_at":"2026-06-10T22:17:02Z","element_count":83,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"7adfccf92cac8a2c095d37bfe8789b618c3b2122562ec4fe160a386bdc5dec50","version":4}]}