docs: add AI policy for contributions

Establishes guidelines for AI usage in contributions, adapted from Astral's policy under MIT license.

Author: Lancetnik

.github/AI_POLICY.md

@@ -0,0 +1,43 @@
+<!--
+AI Policy.
+
+Copied from
+https://github.com/astral-sh/.github/blob/main/AI_POLICY.md
+undert MIT license.
+
+All the credit goes to the Astral team.
+-->
+
+We support using AI (i.e., LLMs) as tools for coding. However, you remain
+responsible for any code you publish and we are responsible for any code we
+merge and release. We hold a high bar for all contributions to our projects.
+
+**AI should not be used to generate comments when communicating with
+maintainers**. We expect comments on our projects to be written by humans. We
+may hide any comments that we believe are AI generated.
+
+If you are opening an issue, we expect you to describe the problem in your own
+words.
+
+If you are opening a pull request, we expect you to be able to explain the
+proposed changes in your own words. This includes the pull request body and
+responses to questions. **Do not copy responses from the AI when replying to
+questions from maintainers.**
+
+Due to the foundational nature of our projects, we require a human in the loop
+who understands the work produced by AI. **We do not allow autonomous agents to
+be used for contributing to our projects**. We will close any pull requests that
+we believe were created autonomously.
+
+If you wish to include context from an interaction with AI in your comments, it
+must be in a quote block (e.g., using `>`) and disclosed as such. It must be
+accompanied by human commentary explaining the relevance and implications of the
+context. Do not share long snippets.
+
+We understand that AI is useful when communicating as a non-native English
+speaker. If you are using AI to edit your comments for this purpose, please take
+the time to ensure it reflects your own voice and ideas. If using AI for
+translation, we recommend writing in your native language and including the AI
+translation in a quote block.
+
+P.S. Respectfully copied from [Astral](https://github.com/astral-sh/.github/blob/main/AI_POLICY.md) team under MIT license.