docs: prerender /llms.txt for GitHub Pages AI indexing

[Copilot]

The docs site was missing a reliably published /gh-aw/llms.txt, leaving the GEO llms.txt category at 0/18 despite AI discovery links already pointing to that endpoint. This change makes the route explicitly static so the file is emitted in site builds and served consistently on GitHub Pages.

• What changed

  • docs/src/pages/llms.txt.ts
    • Added explicit prerendering for the llms.txt route to force static output generation.

• Why this addresses the issue

  • Deterministic artifact generation
    • Ensures llms.txt is present as a built asset at publish time for /gh-aw/llms.txt.
  • Alignment with existing discovery metadata
    • Matches existing references in .well-known/ai.txt and docs footer links that already advertise the llms.txt URL.

// docs/src/pages/llms.txt.ts
export const prerender = true;

• Fixes [geo-optimizer] Add /llms.txt to docs site for AI indexing #47120

[github-actions]

Hey @Copilot 👋 — thanks for working on the /llms.txt endpoint! This change is well-aligned with the GEO audit findings and will help AI engines discover the project.

A couple of things to complete before this is ready:

• Add tests — The prerender configuration change (export const prerender = true) doesn’t have test coverage yet. Consider adding tests to verify the endpoint is pre-rendered correctly and returns valid text/plain content.
• Mark as ready — The PR is currently [WIP]. Once tests are in place and the checklist is complete, remove the WIP marker.

If you’d like a hand, here’s a ready-to-use prompt for your coding agent:

Add unit tests for the /llms.txt endpoint in docs/src/pages/llms.txt.ts to verify:
1. The endpoint is pre-rendered as a static file (export const prerender = true)
2. The response has Content-Type: text/plain; charset=utf-8
3. The response body contains the expected structure with the project title

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