- Replaced macOS `Process::children` and `descendants` traversal with a one-shot `proc_listallpids` scan grouped by `pbi_ppid`, avoiding the broken self-query path in `proc_listchildpids`.
- Built `snapshot_all_pids` and `build_process_tree` helpers and updated descendant collection to walk that tree once, de-duplicating by PID in post-order.
- Added a Unix regression test that verified a freshly spawned child appears in `live_descendants`, preventing silent no-op cleanup on affected darwin kernels.
can1357
338ec7284f