{"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-7cng77tf","versions":[{"created_at":"2026-06-13T23:45:20Z","element_count":143,"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 / 吹抜中庭 / 分譲二世帯 / 断熱レベル5 / 耐雪荷重200kgf/m2","saved_by":"mcp:create","sha256":"","version":1}]}