{"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-23almhq8","versions":[{"created_at":"2026-06-10T13:26:13Z","element_count":85,"note":"backfill: 延床=居室床スラブ実面積81.4㎡(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":"824d7985f1bdd0d20074f7a4c9ddc42144d58b4769be5dfb3559d329b8ba00a8","version":9},{"created_at":"2026-06-10T11:26:46Z","element_count":83,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"862ec674f358f6963c2820ce89a6028602e210b6df401e4279c06249ebce57f8","version":3}]}