{"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-ysu1lhk1","versions":[{"created_at":"2026-06-11T01:22:11Z","element_count":90,"note":"5軸GA polish 45->98 by M5 (autonomous)","saved_by":"mcp","sha256":"1d994b96ca805f657bbc4999e786642e8887c270394a8c5cdd8c6ad1fb302035","version":12},{"created_at":"2026-06-10T22:47:33Z","element_count":46,"note":"loop3: 設計時延床 80.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"c26276b28777ed42aeef2d7c5c611da385c23ee47d327063a268db2644c89d19","version":2}]}