When systemctl stop fails, stop_all asks is-active for each of the two
units and the error names each state (active, inactive, failed, unknown)
beside the exit status; brake hold says the brake is held and the stop
failed, not that the units were not stopped. Exit 2 and the held brake
are unchanged. Follow-up brake-partial-stop-message.
Not yet built; verified at the head of the cut.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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