The 124 remap was vetoed only by "Update not complete", but the restart
and verify phase prints other failure lines after "Update complete!":
"Update incomplete — …", "✗ <unit> failed to come back/stay running
after restart", "verification incomplete". Any of them now keeps the
watchdog kill a failure. Only text after the last banner is inspected,
and ✗ is matched as \u2717 because Windows PowerShell reads the BOM-less
script as ANSI.
Reported by @unsupportedpastels in review.
7f7e1ab402