{"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-9xn73rae","versions":[{"created_at":"2026-06-12T18:57:37Z","element_count":104,"note":"言葉から生成: 平屋(矩形) / 平屋の別荘・大きな軒・土間 / 吹抜け / 大きな軒 / 土間 / 雪庇対策 / 断熱仕様","saved_by":"mcp:create","sha256":"","version":1}]}