Invocation of subagent creates a new session

[paoloricciuti]

Right now if the agent launches a subagent it counts as a new session...it would be cool to have that session at least tied to the parent session so that you can see in the UI that invoked a new session (and maybe mark it as a subsession so they can be filtered out from the main view)

[waynesutton]

@paoloricciuti, thanks for the request. I'll look at this over the weekend, as it would require updating all plugins.