Replace 50 ms procfs sampling with event-backed capture of root/child/
grandchild spawn, exit, re-exec, and reparent events (#332).
- eventProcessTree.ts: domain schemas for event types (spawn, exit,
re_exec, reparent, signal, name_change, thread_create, thread_exit)
and reconstructed process nodes with children, timestamps, and
lineage tracking.
- reconstructProcessTree: rebuilds the full process tree from events,
tracking short-lived descendants, re-exec, and reparenting.
- Utility functions: getDescendants, containsProcess, maxTreeDepth.
- Integration is cross-platform where supported; unsupported platforms
report typed unavailability via the event schema.
Closes#332
morluto