chore(guardrails)!: remove python-only guardrails example plugin

[afourniernv]

Overview

Remove the old NeMo Guardrails example plugin from examples/ and clean up the remaining docs and test references to that deprecated example surface.

• 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

This PR:

• removes examples/nemoguardrails and its bundled agent/example assets
• removes the dedicated Python test for the example plugin
• deletes the old docs/build-plugins/nemoguardrails.mdx page
• trims the last Build Plugins docs link that pointed to the removed example page
• removes obsolete Fern cleanup rewrite rules that referenced the deleted example files

Validation:

• uv run pre-commit run --files docs/build-plugins/about.mdx scripts/docs/fern_cleanup.py docs/build-plugins/nemoguardrails.mdx examples/nemoguardrails/README.md examples/nemoguardrails/example/agent_example.py examples/nemoguardrails/example/example_config.yml examples/nemoguardrails/example/plugin.py examples/nemoguardrails/example/rails/config.yml python/tests/test_nemoguardrails_example_plugin.py
• uv run pre-commit run --all-files

Pre-commit caveat:

• full pre-commit only failed docs markdown linkcheck because this environment could not reach several external public URLs; the cleanup branch did not leave any example-plugin references behind

Where should the reviewer start?

Start with:

• docs/build-plugins/about.mdx
• scripts/docs/fern_cleanup.py
• the deleted examples/nemoguardrails tree

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

• Relates to: none

Summary by CodeRabbit

Release Notes

• Documentation

  • Removed NeMo Guardrails Example Plugin documentation page and related guide references.

• Chores

  • Removed NeMo Guardrails example code and associated test suite.

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[coderabbitai]

Walkthrough

This PR removes the NeMo Guardrails example plugin from the repository. The removal includes example code files, configuration files, test suite, documentation pages, and documentation build script references.

Changes

NeMo Guardrails example removal

Layer / File(s)	Summary
Example configuration and implementation removal examples/nemoguardrails/example/rails/config.yml	Guardrails configuration file containing model selections, input/output rail flow definitions, and prompt templates is deleted.
Documentation link and reference cleanup scripts/docs/fern_cleanup.py	Removed link replacement entries for NeMo Guardrails example files from the Fern documentation cleanup mapping, so those specific documentation paths are no longer rewritten.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	Description includes all required template sections with comprehensive details: overview with confirmations, detailed list of changes, guidance for reviewers, and related issues reference.
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	Title follows Conventional Commits format with type 'chore', scope 'guardrails', breaking change indicator '!', and concise imperative summary under 72 characters.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

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

[afourniernv]

/ok to test 8310378

[github-actions]

Fern docs preview: https://nvidia-preview-pull-request-198.docs.buildwithfern.com/nemo/relay (​https://nvidia-preview-pull-request-198.docs.buildwithfern.com/nemo/relay​)

[afourniernv]

/ok to test d22ecf2

[afourniernv]

/merge