Add CliError, a command error that exits cleanly under a CLI run - #928
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A
call_parsefunction that cannot continue raisesCliErrorwith a message for the user. Under a CLI run the message goes to stderr and the process exits with status 1, without a traceback. From Python the exception propagates like any other, so library code no longer needsraise SystemExit, which asyncio treats as fatal when it escapes a task. See thecall_parsesection of the script notebook, afteris_cli.