we are thinking a lot about how to make deepagents more async native. specifically about making async subagents work better/more prominent one key question is how does a finished subagent "notify" the parent agent? some default behaviors we're considering for when the parent is still running: 1/ interrupt parent run, apply subagent update, continue (basically same as "steer") 2/ wait for parent run to finish, then batch subagent update with any other new messages (basically same as…