* feat(plugin): support cross-host navigation
Keep route construction inside Paseo while letting plugin surfaces target a host other than the currently selected one. Calls without a server ID retain selected-host behavior.
* test(plugin): cover cross-host navigation
Exercise workspace and agent navigation against a second live daemon so the SDK contract is verified through the caller-visible route instead of mocked helper forwarding.
* test(plugin): clarify cross-host navigation journey
Keep the scenario at the caller-visible intent level while shared helpers own route waits and visibility mechanics.
---------
Co-authored-by: paseo-bot[bot] <266920839+paseo-bot[bot]@users.noreply.github.com>