Checking PR #29950: ci: add LLM review rules (Formalities Audit)

✅ Pull request originates from a dedicated feature branch (add-llm-rules)

Commit 7472100 - ci: add LLM review rules:

✅ Author and committer identities are valid
✅ Commit is not a merge commit
✅ Commit subject layout and length are valid: "ci: add LLM review rules"
✅ Commit description lines adhere to width formatting rules
✅ Commit contains a consistent and valid 'Signed-off-by:' line
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⚠️ Warning: No reference link (e.g., upstream release notes, changelog, or history URL) detected in description.