fix: Exit with status 1 when a command fails

[distantnative]

Review

• Rough pass

Timing:

Description

When a command throws, CLI::handleException() prints the error and then calls a bare exit;, so the process ends with status 0. To a shell, cron, CI or a monitoring service, every failed command looks like it succeeded.

handleException() now calls exit(1). The error output is unchanged and --debug still rethrows.

Changelog

🐛 Bug fixes

• Failed commands now exit with status 1 instead of 0, so shells, CI, cron and monitoring can detect them.