{"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-35kxu97y","versions":[{"created_at":"2026-07-19T00:13:44Z","element_count":257,"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 / 南面大開口 / 高断熱仕様 / 浴室乾燥機 / 駐車2台分","saved_by":"mcp:create","sha256":"","version":1}]}