{"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-u8ehpl65","versions":[{"created_at":"2026-07-16T13:25:46Z","element_count":171,"note":"言葉から生成: 総2階(箱) / 二世帯住宅・玄関2つ・水回り分離 / 吹抜け / 南面大窓 / 機械換気 / 見通し廊下","saved_by":"mcp:create","sha256":"","version":1}]}