- each PrintAbove block is one bubbletea print message sent straight to
the program's queue under liveMu, so the event loop prints it in call
order instead of a command goroutine racing it back
- runLive unregisters, sends finishMsg and waits under liveMu, so a late
printer writes after the final frame and no line is lost
- TestPrintAboveOrderedNoLoss pins order and no loss for spinner,
progress, process and a printer racing the finish (CR-01)
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