feat(k6): add load test script

k6/load-test.js

@@ -0,0 +1,36 @@
+// FALLBACK k6 load-test script.
+// This static skeleton is only used when The Watcher agent fails to generate
+// a bespoke k6 script tailored to the application's detected HTTP endpoints.
+// When generation succeeds, the agent produces a custom script that replaces
+// this file in the scaffolded output repository.
+import http from 'k6/http';
+import { check, sleep } from 'k6';
+
+export const options = {
+  scenarios: {
+    load_test: {
+      executor: 'ramping-vus',
+      startVUs: 0,
+      stages: [
+        { duration: '10s', target: 10 },
+        { duration: '30s', target: 10 },
+        { duration: '5s', target: 0 },
+      ],
+    },
+  },
+  thresholds: {
+    http_req_duration: ['p(95)<500'],
+    http_req_failed: ['rate<0.01'],
+  },
+};
+
+const BASE_URL = `http://otel-demo.demo-apps.svc.cluster.local:80`;
+
+export default function () {
+  const res = http.get(`${BASE_URL}/`);
+  check(res, {
+    'status is 200': (r) => r.status === 200,
+    'response time < 500ms': (r) => r.timings.duration < 500,
+  });
+  sleep(0.5);
+}