Upstream:
- 12.3.8: detect PID reuse in worker start-guard (#2082) — fixes
docker container restart where new worker inherits the old PID
and kill(pid, 0) falsely reports the old instance alive. Uses
/proc/<pid>/stat starttime on Linux and `ps -p <pid> -o lstart=`
on macOS/POSIX as an opaque process-start identity token.
Low impact for macOS Desktop users but worth carrying.
Local fixes preserved: env-sanitizer PATH extension, SessionStore
stale session reset. Both verified in built worker-service.cjs.
Worker restarted to v12.3.8.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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