panic: send on closed channel after RECONNECT from TMI

[zephyrtronium]

robot/robot.go

Line 124 in 3cdb7ff

err = tmi.Connect(ctx, cfg, &tmiSlog{slog.Default()}, robo.tmi.send, robo.tmi.recv)

tmi.Connect closes the recv channel when it returns, but we reuse it for subsequent connections. That causes a panic whenever we RECONNECT.

Fixing this may be slightly tricky because we don't really have ownership over the channel here and we have also passed it to tmiLoop above. Along with what I've been stuck on for #58, this makes me think we need to move more work out of config loading.