doc: generate llms.txt

[araujogui]

Related #59264

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.31%. Comparing base (92f48f4) to head (8ff2ec9).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62027      +/-   ##
==========================================
- Coverage   90.31%   90.31%   -0.01%     
==========================================
  Files         730      730              
  Lines      234653   234653              
  Branches    43952    43942      -10     
==========================================
- Hits       211926   211921       -5     
+ Misses      14474    14458      -16     
- Partials     8253     8274      +21     

see 46 files with indirect coverage changes

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[targos]

Is there any evidence that AI systems use it?

[araujogui]

Is there any evidence that AI systems use it?

Evidence is hard to find because training data pipelines are very opaque but some usage from ai providers I found:

https://code.claude.com/docs/llms.txt
https://ai.google.dev/api/llms.txt
https://microsoft.github.io/genaiscript/.well-known/llms.txt

[Copilot]

Pull request overview

This PR updates the Node.js core documentation build to also generate an out/doc/llms.txt artifact (related to #59264’s work on improving module descriptions for llms.txt in doc-kit tooling).

Changes:

• Extend doc-only to include out/doc/llms.txt as a produced documentation artifact.
• Add a new Makefile rule that runs @node-core/doc-kit with the llms-txt template to emit out/doc/llms.txt.

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73719/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73726/

[avivkeller]

@araujogui can you rebase?

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/73762/

[nodejs-github-bot]

Landed in 13feb34