fix: address greptile feedback

server/src/services/heartbeat.ts

@@ -607,6 +607,9 @@ function isTrackedLocalChildProcessAdapter(adapterType: string) {
   return SESSIONED_LOCAL_ADAPTERS.has(adapterType);
 }
 
+// A positive liveness check means some process currently owns the PID.
+// On Linux, PIDs can be recycled, so this is a best-effort signal rather
+// than proof that the original child is still alive.
 function isProcessAlive(pid: number | null | undefined) {
   if (typeof pid !== "number" || !Number.isInteger(pid) || pid <= 0) return false;
   try {