{"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-hk32iav7","versions":[{"created_at":"2026-06-11T03:57:28Z","element_count":70,"note":"5軸GA polish 46->96 by M5 (autonomous)","saved_by":"mcp","sha256":"de440c9d7e6f70750c02c79d06b24cd9b885b35dfca6dea871a3bb19c1e7881b","version":3},{"created_at":"2026-06-11T03:46:43Z","element_count":90,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"0871ae467bdbb3099668018ceb875c6e345a46c0dff0656ea7469e8339935bda","version":2}]}