Automatic discovery and driver selection for unmodeled next-hop devices in path trace

NetBrain path trace currently stops abruptly when it encounters a next-hop device that has not been modeled in the system, whether the trace is running live or against cached data. This forces users to manually model the device before the trace can continue, interrupting the troubleshooting workflow. This enhancement would allow the path trace engine to automatically attempt discovery of an unmodeled next-hop device by logging in with available credentials, identifying its platform and software version, and applying the appropriate driver to continue the trace without manual intervention. Customers troubleshooting paths that cross undocumented or newly added devices would gain uninterrupted end-to-end path visibility, reducing the manual effort required to keep the network model current.