- while a view runs, runLive relays SIGINT and SIGTERM (unless ignored);
on a signal it kills the program, which shows the cursor and restores
the terminal, unregisters the view, stops relaying and raises the same
signal again, so the default action or the command's own handler still
applies
- the generated main, bonfire.Execute's context and Ctrl+C for commands
without a live view are unchanged
- TestLiveViewRestoresTerminalOnSignal pins both paths in a re-executed
helper process (WR-01)
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