The UrsulaCommandProtocol is super useful, but it's rare to want to use it by surprise (ie, without knowing in advance that you'll want to). The use of lineReceiver to capture input for UrsulaCommandProtocol has a sometimes undesired side effect of pre-empting subsequent stdout emission.

It's possible that this is moot, as we'll want to refrain from any standard output (instead directing to a more intentional log surface) at the moment that UrsulaCommandProtocol normally takes over, but as #941 shows us, it's still useful to have a sane default when standard out is the order of the day.