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9f04f06351
Two bugs caused the brainstorm server to self-terminate within 60s: 1. ownerAlive() treated EPERM (permission denied) as "process dead". When the owner PID belongs to a different user (Tailscale SSH, system daemons), process.kill(pid, 0) throws EPERM — but the process IS alive. Fixed: return e.code === 'EPERM'. 2. On WSL, the grandparent PID resolves to a short-lived subprocess that exits before the first 60s lifecycle check. The PID is genuinely dead (ESRCH), so the EPERM fix alone doesn't help. Fixed: validate the owner PID at server startup — if it's already dead, it was a bad resolution, so disable monitoring and rely on the 30-minute idle timeout. This also removes the Windows/MSYS2-specific OWNER_PID="" carve-out from start-server.sh, since the server now handles invalid PIDs generically at startup regardless of platform. Tested on Linux (magic-kingdom) via Tailscale SSH: - Root-owned owner PID (EPERM): server survives ✓ - Dead owner PID at startup (WSL sim): monitoring disabled, survives ✓ - Valid owner that dies: server shuts down within 60s ✓ Fixes #879