Test AI maintainer summary on pull requests

[ExRecon]

This is a temporary docs-only pull request to verify that the AI Maintainer Summary workflow runs on pull_request events and posts its summary comment.

Change scope:

• add one harmless test note to README_AI_SETUP.md

If the workflow behaves as expected, this PR can be closed after verification.

[github-actions]

AI Maintainer Summary

Summary

This is a docs-only test PR that adds a harmless note to README_AI_SETUP.md to verify the AI Maintainer Summary workflow runs on pull_request events and posts a summary comment.

Impact

No functional code changes. Risk is low, with the main concern being workflow reliability rather than product behavior. The only modified file is documentation, so runtime impact should be none.

Follow-ups

• Confirm the summary workflow triggers correctly on this PR and comments as expected.
• Verify the generated summary is concise and accurate for docs-only changes.
• Close this PR after validation.
• No testing gaps for application logic, but CI/workflow behavior should be checked.

Generated with gpt-5.4-mini via the OpenAI Responses API.