hermes update treated a failed desktop pack as non-fatal and still printed
✓ Update complete!, so Windows users kept running an old Hermes.exe after a
"successful" update. Withhold the success banner, surface the stale app in
the summary, and write .update_exit_code=1 for gateway watchers.
Supersedes #88359, #87984.
Co-authored-by: joaomarcos <joaomarcosdias444@gmail.com>
Co-authored-by: liuhao1024 <sunsky.lau@gmail.com>
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