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ownerAlive() treated EPERM (permission denied) the same as ESRCH (process not found), causing the server to self-terminate within 60s whenever the owner process ran as a different user. This affected WSL (owner is a Windows process), Tailscale SSH, and any cross-user scenario. The fix: `return e.code === 'EPERM'` — if we get permission denied, the process is alive; we just can't signal it. Tested on Linux via Tailscale SSH with a root-owned grandparent PID: - Server survives past the 60s lifecycle check (EPERM = alive) - Server still shuts down when owner genuinely dies (ESRCH = dead) Fixes #879