[codex] mention llms indexes in agent docs

[abersheeran]

What changed

This PR adds explicit documentation that the Fish Audio docs site already exposes built-in LLM-friendly indexes:

• https://docs.fish.audio/llms.txt
• https://docs.fish.audio/llms-full.txt

The references were added to the two most relevant entry points for agent users:

• developer-guide/resources/agent-quickstart.mdx
• developer-guide/resources/coding-agents.mdx

Why

The site already provides these endpoints, but they were easy to miss. Making them explicit helps agent users and RAG pipelines discover the right retrieval entry points faster and reduces unnecessary page-by-page crawling.

Impact

Readers now get a clearer path for:

• starting with llms.txt for the curated index
• falling back to llms-full.txt for broader context
• understanding that these endpoints are first-class parts of the docs experience

Validation

• Ran npx prettier --check developer-guide/resources/agent-quickstart.mdx developer-guide/resources/coding-agents.mdx

Summary by CodeRabbit

• Documentation
  • Introduced "Built-In Agent Indexes" section describing available index files designed for agent implementations
  • Added recommendations on index retrieval preferences with guidance on which files to consult first for different scenarios
  • Clarified best practices for selecting appropriate indexes based on documentation scope and integration needs

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[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dba15cf1-a313-40bb-af48-1871be95a316

📥 Commits

Reviewing files that changed from the base of the PR and between 489b1ba and 17cbcff.

📒 Files selected for processing (2)

• developer-guide/resources/agent-quickstart.mdx
• developer-guide/resources/coding-agents.mdx

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📝 Walkthrough

Walkthrough

These changes update documentation to introduce two LLM-oriented index files (llms.txt and llms-full.txt) across agent-related guides. Updates include a new "Built-In Agent Indexes" section, a clarifying note about which index to prioritize, JSX formatting adjustments, and import statement style changes.

Changes

Cohort / File(s)	Summary
Agent Documentation Updates developer-guide/resources/agent-quickstart.mdx, developer-guide/resources/coding-agents.mdx	Added "Built-In Agent Indexes" section introducing llms.txt and llms-full.txt files with retrieval preferences; included explanatory <Note> component; reformatted JSX components and indentation; updated import quotes from single to double; ensured newline at end of file.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• improve agent-friendly docs output #68: Modifies the same documentation pages and introduces the LLM index files referenced in this PR.

Suggested reviewers

• twangodev

Poem

🐰 Hop skip and a jump through docs so bright,
New indexes shine with LLM light,
Quotes and formatting now align,
Agent guides gleam by design! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The PR title directly and accurately reflects the main change: adding documentation about LLM-friendly indexes to agent-focused guide pages.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/mention-llms-indexes

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