{"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-9lst9936","versions":[{"created_at":"2026-07-06T08:47:35Z","element_count":246,"note":"言葉から生成: L字 / 二世帯住宅・玄関2つ・水回り分離 / 中庭採光 / 吹抜 / 耐震等級3 / 断熱等級4","saved_by":"mcp:create","sha256":"","version":1}]}