Register a custom WebdriverIO service with separate launcher and worker lifecycle hooks in wdio.conf.js

Steps

1. Add the service to the `services` array in wdio.conf.js as an imported class or string plus an options object: `services: [[CustomService, { someOption: true }]]`
2. Export a worker-scoped service class as default and a launcher-scoped class as `export const launcher = CustomLauncherService` — the two run in separate processes and cannot share in-memory state
3. Implement launcher-only hooks (`onPrepare`, `onWorkerStart`, `onWorkerEnd`, `onComplete`) for setup/teardown that should run once for the whole test run
4. Implement worker hooks (`beforeSession`, `before`, `beforeTest`, `afterTest`, `after`, `afterSession`, etc.) for per-worker/per-test behavior
5. Throw a `SevereServiceError` (imported from the `webdriverio` package) inside a hook to abort the run immediately; a plain `Error` is only logged and the run continues
6. Publish reusable services under the `wdio-*-service` npm naming convention with `wdio-plugin`/`wdio-service` keywords so users can reference them by short name in `services`