{"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-4ybbjcj4","versions":[{"created_at":"2026-06-11T03:57:02Z","element_count":72,"note":"5軸GA polish 47->97 by M5 (autonomous)","saved_by":"mcp","sha256":"9bccdd4dcee80ecf5dcde653206f1c1115c54d1dbb530ad33fa2b6400e650352","version":3},{"created_at":"2026-06-11T03:42:24Z","element_count":94,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"68f666f7b1bb3ac848daaf7949b9b4d9df75e8c32e7dcf7f2ef7545ca6a425bc","version":2}]}