{"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-ckfvx2z9","versions":[{"created_at":"2026-10-24T06:25:11Z","element_count":153,"note":"","saved_by":"mcp","sha256":"fd2c44ef6b996db283429ab1924299e76714d277dc46b9e1f35c818385d414b5","version":2},{"created_at":"2026-10-24T06:23:38Z","element_count":153,"note":"言葉から生成: リビング・ダイニング・キッチン・寝室・浴室・洗面所・玄関","saved_by":"mcp:create","sha256":"","version":1}]}