{"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-o84qrpdd","versions":[{"created_at":"2026-06-30T16:06:34Z","element_count":141,"note":"言葉から生成: 総2階(箱) / ロフト付きワンルーム・吹抜・大開口 / 吹抜 / 大開口 / ロフト / 断熱グレードG","saved_by":"mcp:create","sha256":"","version":1}]}