Wait for a submitted scan to finish by polling its status every poll_interval_s seconds, up to timeout_s seconds (default 180). Returns the final compact summary (URL, final URL, status, completion time and the security verdict), or the last known status with timeout set to true if the scan is still running. The security verdict is computed after the scan completes, usually within about a minute: until then verdict_pending is true and the verdict fields are empty, so a risk score of 0 is not yet a verdict. scan_id is the UUID of a ScanMalware scan.