{"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-ahzswdhx","versions":[{"created_at":"2026-08-01T19:10:56Z","element_count":255,"note":"言葉から生成: L字 / ロフト付きワンルーム・吹抜・大開口 / 吹抜 / ロフト / 大開口","saved_by":"mcp:create","sha256":"","version":1}]}