{"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-gl056l9l","versions":[{"created_at":"2026-08-04T08:28:00Z","element_count":139,"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系統設置 / 水回り完全分離 / 吹抜けによる採光・換気 / 断熱等級4・気密等級C等級2 / 耐震等級3","saved_by":"mcp:create","sha256":"","version":1}]}