feat: add daily product intelligence and versioned site assets (#64)

Adds privacy-safe aggregate product intelligence, reviewed/versioned website assets, and a dispatch-only rollout until the dedicated Sentry token is verified. Independent review blockers were fixed in 8bc47e4; app checks, website production build, Android CI, and iOS CI are green.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

website/app/beta/layout.tsx

@@ -0,0 +1,18 @@
+import type { Metadata } from 'next'
+
+export const metadata: Metadata = {
+  title: 'Join the Beta',
+  description:
+    'Sign up as a beta tester for OpenCode Mobile on Google Play. Help us test, find bugs, and shape the product before public launch.',
+  alternates: { canonical: 'https://opencode.agentlabs.cc/beta' },
+  openGraph: {
+    title: 'Join the OpenCode Mobile Beta',
+    description:
+      'Get early access to OpenCode Mobile on Google Play. We need 20 testers to unlock the public release.',
+    url: 'https://opencode.agentlabs.cc/beta',
+  },
+}
+
+export default function BetaLayout({ children }: { children: React.ReactNode }) {
+  return children
+}