GatewayRunner.__init__ snapshotted _ephemeral_system_prompt once from the
launch profile's config and _get_system_prompt_for_channel returned that
string for every source, so under multiplex a routed profile's
display.personality / agent.system_prompt never injected (#89161), and
/personality from any chat rewrote the one process-global attribute for
everyone.
Drop the snapshot: _get_system_prompt_for_channel now calls
_load_ephemeral_system_prompt() (env var, then
resolve_ephemeral_system_prompt_from_config(_load_gateway_runtime_config()))
on each call. Its caller run_sync already runs inside
_profile_runtime_scope, so the routed profile's config.yaml is what gets
read; single-profile hot-edits of the personality also take effect on the
next turn instead of requiring a restart. /personality only persists via
persist_personality() (get_hermes_home()/config.yaml = the routed profile)
and no longer touches in-memory state.
Fixes#89161
Co-authored-by: worlldz <101180447+worlldz@users.noreply.github.com>
d45bc39667