Merge pull request cuthbertLab#1774 from cuthbertLab/ai-contributions

CONTRIBUTING.md -> AI contributions

Author: mscuthbert

CONTRIBUTING.md

@@ -5,6 +5,14 @@ documentation improvements. The
 Information that was formerly here is now in 
 [Developer Reference](https://www.music21.org/music21docs/developerReference/index.html)
 
+Pull requests or issues created with AI or in other ways not directly authored by the
+contributor must be declared with (AI) or (AI Generated) in their issue/PR titles.
+If not accepted, they will generally be closed without comment unless the contributor has
+a demonstrated track record of being able to fix the code in question.  Reviewers that
+do not disclose AI usage will be politely reminded the first time and may be blocked
+for subsequent lack of disclosure. (New in 2025: this
+is a pre-emptive time savings from experiences on other Open Source projects.)
+
 ## Resources ##
 
 [Module Documentation and User's Guide](https://www.music21.org/music21docs/)