Add AI policy

AI_POLICY.md

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+# AI Policy
+
+Using AI as a tool for proposals or review in this project can be acceptable,
+provided that such use adheres to the following policy, adds value, and does not
+waste the community's time.
+
+A high bar is held for all contributions to this project.
+
+This project requires a human author in the loop who reviews, verifies, and
+fully understands the proposal or change before submission.
+
+You should only open a pull request if you:
+
+- could have written the change yourself
+- understand the existing context, specification and code, and the effect of the
+  suggested changes
+
+Do not leave the first review of AI-generated changes to the reviewers. Verify
+the changes (code review, testing, etc.) before submitting your PR.
+
+Pull requests should not be opened or driven by autonomous agents. A human
+author must choose the work, understand the proposal or change, and be
+responsible for the contribution. For these reasons, do not include agents as
+authors or co-authors of your commits.
+
+You must be able to explain the pull request changes in your own words. This
+includes the pull request body and responses to questions. Do not copy
+responses from an LLM when replying to questions from reviewers.
+
+Reviewers want to engage directly with you, not with generated responses. AI
+should not be used to generate comments when communicating with maintainers and
+other contributors. Comments are expected to be written by humans. Using AI to
+improve grammar or to translate is fine, but the substance of your responses
+must be your own. Comments that are believed to be written by AI may be
+moderated.
+
+If you wish to include context from an interaction with AI in your comments, it
+must be disclosed as such and accompanied by human commentary explaining the
+relevance and implications of the context.
+
+Pull requests that appear to be in violation of the above can be closed without
+notice.
+
+Questions or proposed changes to this policy can be discussed on the [Bitcoin
+Development Mailing List](https://groups.google.com/g/bitcoindev).
+
+This policy was adapted from the AI policy in [Bitcoin
+Core](https://github.com/bitcoin/bitcoin/blob/master/doc/AI_POLICY.md) and in
+[Kubernetes](https://www.kubernetes.dev/docs/guide/pull-requests/#ai-guidance).