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/ui/public-host.example.spec.ts

@@ -0,0 +1,20 @@
+/**
+ * Example UI pattern (not executed in kit CI — consumers own Playwright projects).
+ *
+ * Critical assert: after sign-out, URL host must remain the public host.
+ * This is the failure mode from punimtag #57 (redirect to 10.0.10.121:3001).
+ */
+import { test, expect } from '@playwright/test';
+import { loadConfig, waitForUrlHost, assertPublicHost, TimingCollector } from '../../src/index.js';
+
+test.describe('public host smoke (pattern)', () => {
+  test('base URL is public and reachable', async ({ page }) => {
+    const config = loadConfig();
+    const timings = new TimingCollector();
+    assertPublicHost(config.baseUrl, config.forbidPrivateHosts);
+
+    await timings.measure('goto_home', () => page.goto(config.baseUrl));
+    await waitForUrlHost(page, config.expectedHost);
+    expect(page.url()).toContain(config.expectedHost);
+  });
+});