{"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-ip3zhm14","versions":[{"created_at":"2026-06-11T01:05:15Z","element_count":72,"note":"5軸GA polish 47->95 by M5 (autonomous)","saved_by":"mcp","sha256":"2847b781510b72ff060ba81025e13a26574942c6fc4e2273d78764b4b985b8e8","version":14},{"created_at":"2026-06-10T22:12:32Z","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":"9892d1299a89236ddd3a478bacace13faba049ef21163e00e78ba404d68f119e","version":2}]}