{"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-wc9bp9ex","versions":[{"created_at":"2026-06-16T13:01:15Z","element_count":254,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 吹抜 / 坪庭 / 暖房効率優化 / 雪下ろし易化 / 通風計画","saved_by":"mcp:create","sha256":"","version":1}]}