Replace fs_usage (reports Mach thread IDs, requiring process name matching
with false positives) with eslogger (Endpoint Security framework, reports
real Unix PIDs via audit_token.pid plus fork events for process tree tracking).
Key changes:
- Daemon starts eslogger instead of fs_usage, with early-exit detection
and clear Full Disk Access error messaging
- New two-pass eslogger JSON parser: pass 1 builds PID tree from fork
events, pass 2 filters filesystem events by PID set
- Remove runtime PID polling (StartPIDTracking, pollDescendantPIDs) —
process tree is now built post-hoc from the eslogger log
- Platform-specific generateLearnedTemplatePlatform() for darwin/linux/stub
- Refactor TraceResult and GenerateLearnedTemplate to be platform-agnostic
