Load Testing Script — k6 Performance Suite

## Task
k6 load testing suite with multiple test scenarios and CI integration.

## Requirements
- Tool: k6 (Grafana)
- Language: JavaScript (k6 scripting)
- Scenarios: smoke, load, stress, spike, soak

## Test Suite
```javascript
// Generate a comprehensive k6 test file with:

// Scenarios:
export const options = {
  scenarios: {
    smoke: {
      executor: "constant-vus",
      vus: 1,
      duration: "1m",
      tags: { test_type: "smoke" },
    },
    load: {
      executor: "ramping-vus",
      startVUs: 0,
      stages: [
        { duration: "2m", target: 50 },   // ramp up
        { duration: "5m", target: 50 },   // hold
        { duration: "2m", target: 0 },    // ramp down
      ],
      tags: { test_type: "load" },
    },
    stress: {
      executor: "ramping-vus",
      stages: [
        { duration: "2m", target: 100 },
        { duration: "5m", target: 100 },
        { duration: "2m", target: 200 },  // beyond expected capacity
        { duration: "5m", target: 200 },
        { duration: "2m", target: 0 },
      ],
      tags: { test_type: "stress" },
    },
    spike: {
      executor: "ramping-vus",
      stages: [
        { duration: "10s", target: 500 }, // sudden spike
        { duration: "1m", target: 500 },
        { duration: "10s", target: 0 },   // sudden drop
      ],
      tags: { test_type: "spike" },
    },
  },
  thresholds: {
    http_req_duration: ["p(95)<500", "p(99)<1000"],
    http_req_failed: ["rate<0.01"],        // <1% errors
    "http_req_duration{name:login}": ["p(95)<1000"],
  },
};

// Test flow: realistic user journey
export default function () {
  // 1. Homepage
  // 2. Search
  // 3. View product
  // 4. Add to cart
  // 5. Checkout
  // With think time between steps
}
```

## Implementation Notes
1. Use groups and tags for per-endpoint analysis
2. Add custom metrics: Trend for business operations, Counter for errors
3. Think time: randomized sleep(1-3) between requests (realistic)
4. Data: use SharedArray for test data (users, products)
5. CI integration: run smoke test on every PR, full suite nightly
6. Output: JSON summary for CI threshold checks, InfluxDB for Grafana dashboards