{"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-89m8yrrb","versions":[{"created_at":"2026-06-10T13:15:07Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積78.3㎡(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":"ecb25cf1e0d34bf9098174b3f64aa347a840e591701f51ec17c38517f99508f2","version":10},{"created_at":"2026-06-10T09:21:31Z","element_count":85,"note":"5軸GA polish 60->98 by M5 (autonomous)","saved_by":"mcp","sha256":"756657a77832d80d4e70bc3370d43ff373e4813fbdee95af726715490664d33d","version":2}]}