{"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-i6om12n1","versions":[{"created_at":"2026-06-10T13:23:11Z","element_count":66,"note":"backfill: 延床=居室床スラブ実面積93.5㎡(基礎/屋外/ロフト除外)。設備数量/コスト過大の是正","saved_by":"mcp","sha256":"99cb4a0cfecaf7551e2a2506994aababf58cff6ea09098abed61c987b01e7c9a","version":10},{"created_at":"2026-06-10T10:37:29Z","element_count":92,"note":"5軸GA polish 43->98 by M5 (autonomous)","saved_by":"mcp","sha256":"720c74a81154c3dffcdb02149debcff1ce79f87b47c51b5d4be76a6d0f9e7ab5","version":2}]}