{"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-cbtw49cz","versions":[{"created_at":"2026-06-11T01:05:16Z","element_count":90,"note":"5軸GA polish 47->98 by M5 (autonomous)","saved_by":"mcp","sha256":"c9d077cff168e6ed31a023fab2e8361655583d34c9a861c5547e096b3881c7da","version":14},{"created_at":"2026-06-10T22:13:13Z","element_count":54,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"ccb6235f32297720bd238af245cb55248f54cff4b44dbc0eea9a4243d8e7125a","version":2}]}