{"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-z6ghrn4f","versions":[{"created_at":"2026-06-13T14:35:16Z","element_count":72,"note":"5軸GA polish 46->96 by M5 (autonomous)","saved_by":"mcp","sha256":"eb75bad10de65794b7956dbcb5a2bb4c4d435fa11f02d812cb02122ea3cdc3e0","version":3},{"created_at":"2026-06-13T14:20:25Z","element_count":89,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"56b5ea53e1506f43a01df66e2ddc99a2bdb08a7c6eaa77863444895c62fe98c0","version":2},{"created_at":"2026-06-13T14:20:24Z","element_count":89,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}