{"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-b7eh3463","versions":[{"created_at":"2026-06-16T19:28:18Z","element_count":83,"note":"5軸GA polish 44->98 by M5 (autonomous)","saved_by":"mcp","sha256":"2cebdd09d8ae4623d557b8be3b87a7a4880e0e250c8854e49062eea063fbde94","version":3},{"created_at":"2026-06-16T19:17:44Z","element_count":134,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"1eb052a1d6f46906a855638ee713764943339968154968b24e119c2556121be0","version":2},{"created_at":"2026-06-16T19:17:44Z","element_count":134,"note":"言葉から生成: LDK+主寝室+子供室2+浴室+収納","saved_by":"mcp:create","sha256":"","version":1}]}