docs: clarify Codex --config flag placement

[dagardner-nv]

Overview

Add a warning to docs/nemo-relay-cli/codex.mdx about the placement of the --config flag

• I confirm this contribution is my own work, or I have the right to submit it under this project's license.
• I searched existing issues and open pull requests, and this does not duplicate existing work.

Details

• Add a warning to docs/nemo-relay-cli/codex.mdx about the placement of the --config flag
• Add .nemo-relay to .gitignore

Where should the reviewer start?

Start with docs/nemo-relay-cli/codex.mdx, especially the warning following the dry-run example.

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• Relates to: none

Summary by CodeRabbit

• Documentation
  • Clarified guidance for running Codex through Relay, including where --config overrides should be placed and how override precedence works.
• Chores
  • Updated ignore rules to exclude the Relay local state directory from version control.

[coderabbitai]

Walkthrough

Adds a "Relay" section to .gitignore ignoring /.nemo-relay, and updates codex.mdx documentation with a warning that Codex --config overrides must precede the exec subcommand, explaining precedence between root-level and command-specific overrides.

Changes

Repo hygiene and docs

Layer / File(s)	Summary
Gitignore entry and Codex docs warning .gitignore, docs/nemo-relay-cli/codex.mdx	Adds /.nemo-relay ignore rule and documents that --config overrides placed after exec are command-scoped and take precedence over root-level Relay-provided overrides.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description includes the required overview, details, review start point, and checklist items, with only a minimal related-issue note.
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.
Title check	✅ Passed	The title follows Conventional Commits and accurately summarizes the documentation change.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

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

[github-actions]

Fern docs preview: https://nvidia-preview-pull-request-338.docs.buildwithfern.com/nemo/relay (​https://nvidia-preview-pull-request-338.docs.buildwithfern.com/nemo/relay​)