{"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-d2klnzrb","versions":[{"created_at":"2026-06-11T01:05:14Z","element_count":91,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"aacf1af454c9ee5ac1ef592ae4afaf4e7bfe1cb24bc448b3e64aa309679b3895","version":14},{"created_at":"2026-06-10T22:14:38Z","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":"784359293a17a58f14dc47da5787565b1de6ee7c80c671679b85328227853fbd","version":2}]}