fix(qa): exit QA gates gracefully on Windows (#1064)

process.exit(2) after a successful fetch trips a libuv assertion on Windows and turns the exit code into 127. The four gates set process.exitCode and return instead, and discard the unread reachability response so an early exit does not wait for the server to finish the body.

Co-authored-by: Sameh Khamis <[email protected]>

scripts/qa-traffic-preset-ab.mjs

@@ -145,15 +145,19 @@ async function main() {
 
   try {
     const res = await fetch(APP_URL);
+    // Only the status matters; an unread body can hold the socket open.
+    await res.body?.cancel();
     if (!res.ok) throw new Error(`HTTP ${res.status}`);
   } catch (e) {
     console.error(`Dev server not reachable at ${APP_URL} (${e.message}).`);
-    process.exit(2);
+    process.exitCode = 2;
+    return;
   }
   const status = await fetch(`${APP_URL}/api/tomtom/status`).then((r) => r.json()).catch(() => null);
   if (!status?.hasKey) {
     console.error('Server has no TomTom key — the A/B needs live flow.');
-    process.exit(2);
+    process.exitCode = 2;
+    return;
   }
 
   fs.mkdirSync(OUT_DIR, { recursive: true });