The Windows hand-off's idle watchdog is the only producer of exit 124 on
main (posix.sh has no watchdog and `hermes update` never exits 124), so
the posix remap was dead and goes. The retry-state helper and its
self-test arm collapse into one Resolve-HermesUpdateOutcome check, now
proved end to end through the real hand-off instead: a fake update that
prints its banner and parks silently past a 3 s ceiling surfaces as a
verified success with the gateway fleet restored.
The remap also refuses a run whose output already carries the
"Update not complete" verdict, which supersedes the banner.
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