{"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-w4x2wo5f","versions":[{"created_at":"2026-06-11T01:05:17Z","element_count":71,"note":"5軸GA polish 45->97 by M5 (autonomous)","saved_by":"mcp","sha256":"856b0c2ae47d8a39540df29bc280819fd6258b22bfe7b2f01c8b4beac01bc419","version":13},{"created_at":"2026-06-10T22:27:22Z","element_count":50,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"3a5220edd29b842f2376a700cc02a88b925eb5468722af2d375e0f372aafbff1","version":2}]}