Add AI policy of moderate

AI_POLICY.md

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+# AI Policy
+
+AI-assisted contributions are accepted only if:
+
+- The PR follows the same rules as a non-AI PR.
+- It clearly states that it is AI-assisted and names the tool used.
+- It links to an issue or discussion where a maintainer agreed to the
+  proposed change beforehand.
+- AI-generated descriptions/comments are clearly marked and only used when
+  required.
+- A human drove the tool, reviewed every line, and can explain the change.
+- It was not opened by a fully autonomous agent.
+- You respond to review comments yourself.
+
+This applies to issues and comments as well as pull requests. Using AI for
+translation or grammar help is fine. AI output may infringe copyright; it is
+your responsibility to make sure it does not.
+
+Unsolicited, undisclosed, or low-effort AI PRs will be closed.
+
+Only humans can be named as co-authors, and AI can _never_ sign off on a
+commit. The Linux kernel trailer should be used to credit AI assistance, like
+this:
+
+```text
+Assisted-by: <harness>:<model>
+```