CI: Add agents instructions to change-files exclusion list.

[csadorf]

To save CI cycles.

[coderabbitai]

📝 Walkthrough

Walkthrough

Updated CI and review configurations: the PR workflow's changed-files groups now exclude **/*/agents.md and .coderabbit.yaml for test_cpp and test_python; the repository config .coderabbit.yaml adds high_level_summary_in_walkthrough: true under reviews.

Changes

Cohort / File(s)	Summary
Workflow Configuration ​.github/workflows/pr.yaml	Added exclusion patterns !**/*/agents.md and !.coderabbit.yaml to the changed-files configuration for both test_cpp and test_python file groups.
Repo Review Config .coderabbit.yaml	Added high_level_summary_in_walkthrough: true under the reviews section.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

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Note

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[csadorf]

/merge