`hermes -p <profile> setup gateway` (and `hermes setup` / `hermes import`) reach the
service step through `ensure_gateway_service`, which only knew "is THIS profile's
unit running" — a satellite served by the default multiplexer has no unit of its
own, so the step printed "Installing the gateway background service ..." and
registered a launchd plist / systemd unit that the #97120 start guard then refused,
leaving a stray dead service the user had to find and remove by hand (#111958).
Route both setup surfaces through one shared predicate: `_served_profile_needs_no_service`
wraps `named_profile_served_by_running_multiplexer` (the same probe `profile create`,
cron liveness and the run/start/install guards use), prints the "already served"
note and returns True so `ensure_gateway_service` and the `hermes gateway setup`
wizard (#111962's hunk) skip the install. Default profile and non-multiplex hosts
are unchanged.
Adds the invariant for the `ensure_gateway_service` path (served → no install,
unserved → still installs). Docs: multi-profile-gateways.md names the skipped step.
Co-authored-by: kvnloo <7121943+kvnloo@users.noreply.github.com>
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