Lane of the agent turn the current fiber runs (its light thread, or the prompt a turn on main answers), stamped
on its events as Meta.thread
and on the processes it spawns as Meta.parentThread: one process runs several turns at once,
and the pid alone cannot tell their events apart.
Lane of the agent turn the current fiber runs (its light thread, or the prompt a turn on main answers), stamped on its events as Meta.thread and on the processes it spawns as Meta.parentThread: one process runs several turns at once, and the pid alone cannot tell their events apart.