{"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-ln4tjusg","versions":[{"created_at":"2026-06-30T20:03:09Z","element_count":69,"note":"5軸GA polish 40->92 by M5 (autonomous)","saved_by":"mcp","sha256":"ae9580a6b13e8274a62a9c868fd657ca325b533eec8b1a77be0685ecdf3858ff","version":3},{"created_at":"2026-06-30T19:50:12Z","element_count":101,"note":"loop3: 設計時延床 85.0㎡ を投入 (見積過大の根治)","saved_by":"mcp","sha256":"e640787aa1428868c7a44961c554f6475e95e84c68897425059ef24395dd5db8","version":2},{"created_at":"2026-06-30T19:50:12Z","element_count":101,"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}]}