{"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-opqw7a18","versions":[{"created_at":"2026-06-20T06:33:45Z","element_count":223,"note":"言葉から生成: 総2階(箱) / 越屋根のある自然素材の家・通風重視 / 越屋根(雪庇防止) / 吹抜と高窓(通風) / 土間収納(雪捌き) / 高断熱仕様","saved_by":"mcp:create","sha256":"","version":1}]}