Enable agent-friendly documentation

[jacobtomlinson]

This PR adds the sphinx-llm extension which generates markdown pages in the documentation build output that conform to the llms.txt spec.

This means an agent should be able to visit /llms.txt on your site to get a markdown sitemap, and each page should be published in markdown in addition to HTML to help reduce context/token usage. For example /overview.html also gets published as /overview.md with the same content in markdown, and the /llms.txt sitemap points to /overview.md with a short summary of that page. The HTML page contains meta headers to help agents discover markdown versions if they find the HTML via search.

sphinx-llm works by running the sphinx-markdown-builder in parallel to the primary docs build so that the output of extensions like docref/autodoc/intersphinx/etc is fully rendered in the markdown output. Then it merges the two build outputs following the llms.txt structure.

Note

Optionally, sphinx-llm can also use an LLM during the documentation build to generate richer summaries of pages and compact documentation details into the /llms.txt file to aid agent discovery. However, this PR does not enable this at this time as it requires configuring a model endpoint and credentials and will consume tokens during each docs build in CI. This could be enabled in the future after further discussion.

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Documentation builds now generate Markdown pages and an llms.txt file.
  • Added the required Sphinx LLM package to documentation dependencies and supported CUDA 12.9 and CUDA 13.3 environments for AArch64 and x86_64.
  • The Sphinx LLM extension is enabled in documentation builds.

Walkthrough

The documentation dependency configuration now includes sphinx-llm>=1.1.0 in the documentation group and four CUDA environments. The Sphinx configuration enables the sphinx_llm.txt extension.

Changes

Sphinx LLM documentation setup

Layer / File(s)	Summary
Add sphinx-llm dependency dependencies.yaml, conda/environments/*	The documentation dependency group and four CUDA environment files now include sphinx-llm>=1.1.0.
Enable Sphinx extension docs/source/conf.py	The Sphinx extensions list now includes sphinx_llm.txt.

Priority: ➖ Normal

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Feature

Suggested reviewers: chyunsu3, bdice

Merge Risk: 🟡 Moderate · up to 95cdb

The documentation build environment cannot install the new dependency from its configured Conda channels, blocking documentation builds. Move the package to pip or provide it through a configured Conda channel before merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: enabling agent-friendly documentation through Markdown outputs and llms.txt support.
Description check	✅ Passed	The description directly explains the addition of sphinx-llm, its generated outputs, and the scope of the implementation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

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Inline comments:
In `@dependencies.yaml`:
- Line 358: Move the sphinx-llm>=1.1.0 dependency from the Conda package list
into the pip: section used by the generated Conda environments, unless a
matching Conda package is published; then regenerate all four Conda environment
files from dependencies.yaml.

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• conda/environments/all_cuda-129_arch-aarch64.yaml
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