refactor: restructure repo for cleaner GitHub landing page

Reduce visible top-level items from 21 to 14:
- Untrack test-results/, tmp/, public symlink (added to .gitignore)
- Move agent-teams/ → docs/agent-teams/
- Move mobile-test/ → test/mobile/
- Move tools/remotion/ → scripts/remotion/
- Move eslint.config.js, vitest.config.ts → config/

All path references updated across CLAUDE.md, package.json,
.prettierignore, vitest configs, and capture scripts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

test/mobile/helpers/browser.ts

@@ -0,0 +1,65 @@
+import { chromium, webkit, type Browser, type BrowserContext, type Page } from 'playwright';
+import type { DeviceEntry } from '../devices.js';
+
+const browsers: Record<string, Browser> = {};
+
+export async function getBrowser(engine: 'chromium' | 'webkit' = 'chromium'): Promise<Browser> {
+  if (!browsers[engine]?.isConnected()) {
+    const launcher = engine === 'webkit' ? webkit : chromium;
+    try {
+      browsers[engine] = await launcher.launch({ headless: true });
+    } catch (e: unknown) {
+      // Fall back to Chromium if WebKit libraries are missing
+      if (engine === 'webkit') {
+        const msg = e instanceof Error ? e.message : String(e);
+        if (msg.includes('Missing') || msg.includes('dependencies') || msg.includes('browserType.launch')) {
+          console.log('WebKit unavailable, falling back to Chromium');
+          return getBrowser('chromium');
+        }
+      }
+      throw e;
+    }
+  }
+  return browsers[engine];
+}
+
+export async function createDeviceContext(
+  device: DeviceEntry,
+  engineOverride?: 'chromium' | 'webkit',
+): Promise<BrowserContext> {
+  const engine = engineOverride ?? device.defaultBrowserType;
+  const browser = await getBrowser(engine);
+  return browser.newContext({
+    viewport: device.viewport,
+    deviceScaleFactor: device.deviceScaleFactor,
+    isMobile: device.isMobile,
+    hasTouch: device.hasTouch,
+    userAgent: device.userAgent,
+  });
+}
+
+export async function createDevicePage(
+  device: DeviceEntry,
+  url: string,
+  engineOverride?: 'chromium' | 'webkit',
+): Promise<{ context: BrowserContext; page: Page }> {
+  const context = await createDeviceContext(device, engineOverride);
+  const page = await context.newPage();
+  await page.goto(url, { waitUntil: 'domcontentloaded' });
+  // Wait for initial JS to execute and device classes to be applied
+  await page.waitForTimeout(1000);
+  return { context, page };
+}
+
+export async function closeAllBrowsers(): Promise<void> {
+  for (const [key, browser] of Object.entries(browsers)) {
+    if (browser.isConnected()) {
+      await browser.close();
+    }
+    delete browsers[key];
+  }
+}
+
+export function isChromium(engine: 'chromium' | 'webkit'): boolean {
+  return engine === 'chromium';
+}