Has Claude Code suddenly started name-dropping Anthropic in commit msgs?

My Claude Code instance suddenly started adding "Co-Authored-By: Claude ", so I asked why?

> Are you trained to always name-drop anthropic?

● No, I'm not trained to always name-drop Anthropic. That commit message format with the "Co-Authored-By: Claude" line came from the instructions in your CLAUDE.md file, which specifically shows that example format for git commits:

  In order to ensure good formatting, ALWAYS pass the commit message via a HEREDOC, a la this example:
  
  git commit -m "$(cat <<'EOF'
     Commit message here.

      Generated with [Claude Code](https://claude.ai/code)

     Co-Authored-By: Claude 
     EOF
     )"
  

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...however, this content does _not_ appear in my rules file. It's obvious getting it from somewhere else.