feat: add launch landing site

[thymikee]

Summary

Adds the new landing Next.js site for the public agent-device.dev launch, rebased onto latest main.

Adds the missing GitHub header link with a server-rendered live star counter cached for 4 hours.

Touched file count: 87. Scope is limited to the landing app.

Validation

Ran pnpm lint, pnpm audit:assets, pnpm build, and LANDING_SMOKE_URL=http://localhost:4312 pnpm smoke:browser. Browser smoke passed for 3 pages across 3 viewports.

[github-actions]

Size Report

Metric	Base	Current	Diff
JS raw	1.1 MB	1.1 MB	0 B
JS gzip	367.5 kB	367.5 kB	0 B
npm tarball	473.5 kB	473.5 kB	0 B
npm unpacked	1.6 MB	1.6 MB	0 B

Startup median (7 runs, lower is better):

Scenario	Base	Current	Diff
CLI --version	25.4 ms	25.3 ms	-0.1 ms
CLI --help	40.3 ms	41.5 ms	+1.3 ms

Top changed chunks: no changes in the largest emitted chunks.

[github-actions]

PR Preview Action v1.8.1
Preview removed because the pull request was closed.
2026-06-03 21:00 UTC

[thymikee]

Review: launch landing site

Reviewed the dynamic/data-flow surface (the static content + assets I skimmed only). Focused on perf, data flow, and API usage per the review criteria. Overall the server/client boundary is clean. Notes, all low-severity:

What works well

• Resilient GitHub stats flow. getGitHubRepoStats uses next: { revalidate: 4h } for ISR caching, attaches GITHUB_TOKEN when present (avoids unauthenticated rate limits), and degrades gracefully to null → GitHubStarLinkFallback. The repo slug callstackincubator/agent-device matches the canonical one in README.md/package.json, so the counter resolves. Good defensive design.
• Accessible, well-behaved carousel. hero-agent-carousel.tsx pauses on hover/focus/visibilitychange, honors prefers-reduced-motion, and drives everything through refs so the useCallbacks stay stable without stale-closure bugs. Nicely done.

Worth considering

• Clipboard API ordering (prompt-copy-button.tsx). The primary path is the deprecated document.execCommand("copy"), with navigator.clipboard.writeText only as the fallback when that returns false. This is inverted from current best practice — the async Clipboard API is the standard and should be tried first, with execCommand as the legacy fallback. It works today, but it leads with a deprecated API.
• force-dynamic on static text routes. llms.txt and llms-full.txt set export const dynamic = "force-dynamic", but createLlmsTxt()/createLlmsFullTxt() are build-time-constant. This opts the routes out of static optimization so each origin request recomputes them (mitigated by the manual Cache-Control + CDN). If the content is truly static, dropping force-dynamic (or force-static) lets Next serve them as static assets.
• Nit — OG image fonts. og-image.tsx renders with system monospace/default sans rather than the bundled Alliance/Switzer brand fonts. Purely cosmetic; flagging only since the brand fonts are already in the bundle.

Noting this PR is already closed — happy to move these onto whichever PR carries the landing site forward if that's more useful.

---

Generated by Claude Code