{"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-ku4ggv5z","versions":[{"created_at":"2026-06-10T07:25:29Z","element_count":91,"note":"5軸GA polish 58->98 by M5 (autonomous)","saved_by":"mcp","sha256":"aa213d560919f4d92116908a32d9c53b93bf6bac4bbf4973ad48d848fc6201ac","version":2}]}