{"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-hdey7vyh","versions":[{"created_at":"2026-07-20T17:06:25Z","element_count":222,"note":"言葉から生成: L字 / 二世帯住宅・玄関2つ・水回り分離 / 玄関2か所 / 浴室・トイレ分離 / 吹き抜け / 庇の深い設計 / 高断熱サッシ","saved_by":"mcp:create","sha256":"","version":1}]}