Under gateway.multiplex_profiles, `_start_one_profile_adapters` skipped
Platform.RELAY / Platform.WHATSAPP for secondaries with a bare `continue`,
and the startup "not being served" WARNING only covered platforms the
PRIMARY skipped. Four secondaries on one live box had WHATSAPP_ENABLED=true
and nothing in the log, status file, or `hermes gateway status` said the
channel was dead.
- `_note_unserved_secondary_platform`: one INFO per (profile, platform)
naming the reason (shared process-level ingress owned by the default) and
the remedy (enable it on the default profile, or disable it here), plus a
`<profile>:<platform>` runtime-status stamp (state=disabled,
error_code=multiplex_shared_ingress).
- `_start_secondary_profiles` folds those platforms into the loud WARNING
when NO profile (default included) runs them.
- `hermes gateway status --profile X` prints
`whatsapp: not served under multiplex (shared ingress owned by default)`
from that stamp; /api/status excludes `disabled` entries from the
platforms degraded verdict (informational, not a fault).
- Docs: multi-profile-gateways.md gets the shared-ingress rule.
