Clarified expectations for AI contributions from non-maintainers.
> This PR was written primarily by Claude Code.
-When using AI assistance, we expect contributors to understand the code that is produced and be able to answer critical questions about it.
+When using AI assistance, we expect contributors to understand the code that is produced and be able to answer critical questions about it. Also, AI contributions from non-maintainers needs to have a fairly narrow scope (e.g. a bug fix), as we have limited review capacity.
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