When /update runs via Telegram, hermes update --gateway is spawned inside
the gateway's systemd cgroup. The update process itself calls
systemctl restart hermes-gateway, which tears down the cgroup with
KillMode=mixed — SIGKILL to all remaining processes. The wrapping bash
shell is killed before it can execute the exit-code epilogue, so
.update_exit_code is never created. The new gateway's update watcher
then polls for 30 minutes and sends a spurious timeout message.
Fix: write .update_exit_code from Python inside cmd_update() immediately
after the git pull + pip install succeed ("Update complete!"), before
attempting the gateway restart. The shell epilogue still writes it too
(idempotent overwrite), but now the marker exists even when the process
is killed mid-restart.
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