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.
bcdb49ac7b