Add @levkin/playkit v0.1 shared Playwright/API kit

Ship browser helpers with public-host guards, ApiClient, structured
logging, Prometheus timings, CI, examples, and ROADMAP for consumers.

examples/api/health.example.ts

@@ -0,0 +1,35 @@
+/**
+ * Example: API health check pattern consumers copy into their repos.
+ * Run: PLAYKIT_BASE_URL=https://punimtagdev.levkin.ca npm run example:api
+ */
+import { ApiClient, TimingCollector, loadConfig, createLogger, pushPrometheusMetrics } from '../src/index.js';
+
+async function main() {
+  const config = loadConfig();
+  const log = createLogger({ name: 'example-api', bindings: { project: config.project } });
+  const timings = new TimingCollector(log);
+  const api = new ApiClient({
+    baseUrl: config.apiBaseUrl,
+    logger: log,
+  });
+
+  const res = await timings.measure('health', () =>
+    api.get('/api/health', { expectedStatus: 200 }),
+  );
+
+  log.info('health ok', { status: res.status, durationMs: res.durationMs, data: res.data });
+
+  if (config.metrics.enabled && config.metrics.pushgatewayUrl) {
+    await pushPrometheusMetrics(timings, {
+      pushgatewayUrl: config.metrics.pushgatewayUrl,
+      job: config.metrics.job,
+      grouping: { project: config.project, env: config.env },
+      logger: log,
+    });
+  }
+}
+
+main().catch((err) => {
+  console.error(err);
+  process.exit(1);
+});