docs: add single-provider coding agent recipes

[ryan-lempka]

Add single-provider recipes for Codex and Claude Code, using each CLI's saved login for routing and classifier calls.

Summary by CodeRabbit

• Documentation
  • Added a guide for routing Codex or Claude Code between models from a single provider using saved CLI authentication.
  • Added the guide to the documentation navigation and linked to it from the “Choose a Path” table.

[github-actions]

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[coderabbitai]

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Review profile: CHILL

Plan: Enterprise

Run ID: 6ac6368e-ede8-4f44-9e55-cbec48e8a31b

📥 Commits

Reviewing files that changed from the base of the PR and between 15684f9 and 323802f.

📒 Files selected for processing (3)

• docs/index.md
• docs/recipes/single_provider_coding_agents.md
• mkdocs.yml

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Walkthrough

The documentation adds a single-provider routing recipe for Codex and Claude Code. It describes provider-specific setup, saved-login forwarding, and model-statistics checks. The documentation index and navigation now link to the recipe.

Changes

Coding agents recipe

Layer / File(s)	Summary
Provider setups and routing docs/recipes/single_provider_coding_agents.md	The recipe describes shared routing requirements, Codex and Claude Code configurations, and a command to inspect model statistics.
Guide navigation docs/index.md, mkdocs.yml	The documentation index and MkDocs navigation link to the recipe.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 32380

The Codex setup aligns with the server’s forwarding contract. Claude Code’s saved-login behavior with a custom base URL remains unconfirmed, but no concrete failure or navigation defect is established.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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 0…
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.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding single-provider coding agent recipes for Codex and Claude Code.

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_{I’m a rabbit with a routing chart,
I hop where saved logins start.
Codex and Claude find their way,
Through local models night and day.
I nibble stats, then bounce away.}

_{Comment @coderabbitai help to get the list of available commands.}