{"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-house-jw802fd3","versions":[{"created_at":"2026-06-11T01:22:00Z","element_count":90,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"ff457fde99256cfbfd2e5a384db57021b06d90336464430e18479783433657b8","version":13},{"created_at":"2026-06-10T22:37:24Z","element_count":54,"note":"loop3: 設計時延床 70.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"a919944aa37e28c6fdc58858fce755924e5c8bc71e55a8d49c7aab99b20c68bc","version":2}]}