test(e2e): phase-3 add nightly full run and perf smoke checks (#717)

* test(e2e): phase-3 add nightly workflow and perf smoke suite

* test(e2e): address copilot review for phase-3 fixture and readiness flow

tests/e2e/playwright.config.ts

@@ -4,8 +4,10 @@ export default defineConfig({
   testDir: './specs',
   timeout: 30_000,
   expect: { timeout: 10_000 },
+  retries: process.env.CI ? 1 : 0,
   reporter: [['list'], ['html', { outputFolder: 'playwright-report', open: 'never' }]],
   use: {
     baseURL: process.env.KK_BASE_URL || 'http://127.0.0.1:8012',
+    trace: 'on-first-retry',
   },
 });