Clicking an agent in a multi-profile roster pays the entire backend
spawn + WebSocket dial cost on first open — several seconds of
'loading' (Bot Mode report). Expose the existing pool-only primitive
(openGatewayForProfile: opens/pools the socket WITHOUT activating it,
already no-ops for the primary and shared-remote routes) as
host.warmProfile(name) so rosters can pre-dial after mount and the
first click lands on a live socket. Fire-and-forget by design;
failures stay silent — the real open path re-runs its own ensure.
3c5fd918e3