Should we log out errors which are swallowed?

[geoknee]

In the virtualfund protocol we swallow certain errors:

go-nitro/protocols/virtualfund/virtualfund.go

Lines 86 to 88 in cd34325

	// Ignore stale or future proposals
	if errors.Is(err, consensus_channel.ErrInvalidTurnNum) {
	return nil

(and similarly for the virtualdefund protocol).

I think it would be nice to log this error out at least. To do that, we could bubble it up to the engine, which has access to the logger.

Could have a principle that the engine is the only place (or at least the default place) where errors are swallowed?