{"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-3cflr6e6","versions":[{"created_at":"2026-07-05T06:52:29Z","element_count":140,"note":"言葉から生成: L字 / 二世帯住宅・玄関2つ・水回り分離 / 両世帯玄関分離 / 水回り隣接配置 / 吹抜け+中庭 / 耐風設計 / 太陽光発電","saved_by":"mcp:create","sha256":"","version":1}]}