policy: Add no-LLM policy.

(cherry picked from commit 4ee007994457732a23e6285eb67fe6f45f82ec86)

.github/PULL_REQUEST_TEMPLATE.md

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+- [ ] I confirm that I am the author of this code and release it to the PhysicsFS project under the Zlib license. This contribution does not contain code from other sources, including code generated by a Large Language Model ("AI").
+

AGENTS.md

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+AI must not be used to generate code for contributions to this project.
+
+"AI" in this case means a Large Language Model ("LLM"), such as ChatGPT,
+Claude, Copilot, Grok, etc.
+
+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.
+
+AI can be used to identify issues with contributions to this project, but the
+solutions to those issues should be authored by humans.
+
+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.

CLAUDE.md

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+AI must not be used to generate code for contributions to this project.
+
+"AI" in this case means a Large Language Model ("LLM"), such as ChatGPT,
+Claude, Copilot, Grok, etc.
+
+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.
+
+AI can be used to identify issues with contributions to this project, but the
+solutions to those issues should be authored by humans.
+
+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.
+
+