{"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-2-xx5uuubi","versions":[{"created_at":"2026-06-18T21:08:02Z","element_count":169,"note":"言葉から生成: L字 / リモートワーク2部屋・庭に面した在宅オフィス","saved_by":"mcp:create","sha256":"","version":1}]}