policy: Updated AI-related text based on excellent feedback.

AGENTS.md

@@ -1,11 +1,17 @@
-The SDL project does not accept contributions that are in any part created by
-AI agents.
+AI may not be used to generate code for contributions to this project.
 
-We reject any pull requests that have any amount of code generated by an LLM,
-generative AI, or anything other than a human being.
+AI-generated code is based upon sources of unknown origins and may not be
+compatible with the Zlib license, or may introduce conflicting license terms
+if they include code from other projects.
 
-Any code that was produced this way must be disclosed when submitting it to
-the project.
+AI can be used to identify issues with contributions to this project, but the
+solutions to those issues should be authored by humans.
 
-Thank you!
+We have found that AI will frequently hallucinate issues that are not actually
+problems in practice, report incorrect information, and describe problems that
+are actually not issues at all. If AI identifies a problem with this codebase,
+please make sure you understand what it is saying and have independently
+confirmed that the issue exists before submitting a bug report or pull request.
 
+Any pull request to this project will ask you to confirm that you are the
+author and that you are contributing your changes under the Zlib license.