feature: tmux-agents v1.6.0 close an agent tree
I shipped v1.6.0 of tmux-agents so one tmux-dismiss closes the secondary, worker and the rest of their subtree, deepest first and with each agent reopenable; agents can close any descendant, while --keep-children leaves children running without an owner. An agent waiting for its first task now shows “○ idle”, and an agent that sends its parent a progress notice and waits no longer gets flagged “needs you”, a bug I saw with spirit-earth. Closed agents whose parents were also closed now appear in the right window's list. The worker split the work across three agents of its own, with decisions recorded and 199 checks, including the new tests/dismiss.sh.



