`hermes config set gateway.multiplex_profiles true` warned "not a recognized
config key" although gateway/config.py reads it: the key (and profile_routes)
were never in DEFAULT_CONFIG["gateway"]. Both are registered with their doc
comment; the CLI loaders deep-merge new keys, so no _config_version bump.
`hermes gateway migrate --multiplex` with two or more profiles but no
secondary running its own gateway printed "nothing to migrate" and left the
flag OFF. The explicit command now applies the one remaining step — flag on,
default gateway (re)started, the same rollback manifest (empty secondaries)
for --standalone. `hermes update`'s automatic hook keeps treating that case
as a no-op: it never flips modes on an install where nothing was running.
#108952 taught sms/line/teams/bluebubbles/whatsapp_cloud/msgraph_webhook/feishu/wecom-callback to
serve a secondary at /p/<profile>/ on the default listener; #108928's preflight derives its
port-binder blocker from the adapter class's serves_profile_prefix flag, which those adapters never
set. Merged together, migrate would have blocked every profile the ingress work just unblocked.
Declare the flag on each shared-ingress adapter and run plugin discovery before consulting the
registry (plugin adapters are absent from a bare CLI process otherwise).
The multiplexer skips a secondary profile that enables a port-binding
platform, unless the default listener already answers that platform under
/p/<profile>/. Which adapters do is now a class attribute on the adapter
(api_server and webhook today) instead of knowledge scattered in prose, so
the migration preflight can tell "URL changes" from "profile would be
skipped" and stays correct as new HTTP-inbound adapters gain the prefix.
teknium1