A2AAdapter.__init__ / _default_agent_name / _load_served_agents read
A2A_PORT, A2A_AGENT_NAME and A2A_AGENT_DESCRIPTION from raw os.environ,
so a secondary multiplex profile borrowed the default profile's port and
Agent Card identity. Skip the env read when constructed inside a
secondary profile's scope (_profile_scoped(), #98738 pattern) and fall
to config.extra / module defaults instead. The default profile keeps its
unscoped env precedence.
Salvaged from #100382 (tests trimmed to two).
79732c6452