{"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-he2wd2wf","versions":[{"created_at":"2026-06-11T11:12:38Z","element_count":130,"note":"言葉から生成: 総2階(箱) / 狭小の町家・吹抜・坪庭 / 背面吹抜 / 背面坪庭 / 高天井LDK / 耐風設計 / 換気天井","saved_by":"mcp:create","sha256":"","version":1}]}