Profiles without their own messaging token inherit the default
profile's token via os.getenv, hit a token collision, and exit with
startup_failed. s6 restarts them immediately, creating ~30MB tirith
sandbox dirs in /tmp each cycle — filling the disk in hours (#51228).
Changes:
- gateway/restart.py: add GATEWAY_FATAL_CONFIG_EXIT_CODE = 78
- gateway/run.py: set exit_code=78 on non-retryable startup errors
(token collision, no platforms)
- hermes_cli/service_manager.py: add _render_finish_script() that
translates exit 78 → exit 125 (s6 permanent failure)
- hermes_cli/container_boot.py: write finish script alongside run
script during profile registration
The s6 finish script pattern follows docker/s6-rc.d/dashboard/finish.
Closes#51228
