Run added the start-up status bar and welcome lines through
SetStatus and AddStatus before it started the tview event loop. Both
wait for that loop, so neoirc-cli stopped before it showed its
screen. They now run on a goroutine, as typed lines do.
Run now passes a new UI to run, which holds the start-up path and
returns its error. TestStartUp calls run with a simulation screen and
fails if the status window does not get the welcome lines within five
seconds.
Model: opus-5-5
