Instantiate models with keyword arguments now, no longer via "params" dictionary; although API still uses this name when passing Pydantic parameters models.  API describes model via its info property now, which passes instance property, not its init arguments.

Renamed some model classes; expanded scope of trivial object classification model to be functional base on intensity threshold, too

Incomplete, but replacing manual status code assertions with assertion methods of TestServerBaseClass

Put simplest functional RoiSet pipeline model_server for now; derived channel and boundary seg alternatives in trec-adaptive-feedback

Server starts; needed to remove old app routing from test class.  Loading a real object classifier instead of dummy.