Add AI policy (#2916)

Author: serenibyss

AI_POLICY.md

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+# AI Usage Policy
+
+This project has strict rules for AI usage:
+
+* **All AI usage in any form must be disclosed.** You must state
+the tool you used (e.g. Claude Code, Cursor, Amp) along with
+the extent that the work was AI-assisted.
+* **The human-in-the-loop must fully understand all code.** If you
+can't explain what your changes do and how they interact with the
+greater system without the aid of AI tools, do not contribute
+those changes.
+* **Issues and discussions can use AI assistance but must have a full
+human-in-the-loop.** This means that any content generated with AI
+must have been reviewed *and edited* by a human before submission.
+AI is very good at being overly verbose and including noise that
+distracts from the main point. The author must do their research and
+trim this down.
+* **No AI-generated media is allowed (art, images, videos, audio, etc.).**
+Text and code are the only acceptable AI-generated content, per the
+other rules in this policy.
+* **Bad AI drivers may be blocked** People who produce bad contributions
+that are clearly AI (slop) may be blocked from making future contributions.
+We love to help junior developers learn and grow, but if you're interested
+in that, don't use AI and we'll help you. We're sorry that bad AI
+drivers have ruined this for you.
+
+## There are Humans Here
+
+Please remember that this project is maintained by humans.
+
+Every discussion, issue, and pull request is read and reviewed by
+humans (and sometimes machines, too). It is a boundary point at which
+people interact with each other and the work done. It is rude and
+disrespectful to approach this boundary with low-effort, unqualified
+work, since it puts the burden of validation on the maintainer.
+
+In a perfect world, AI would produce high-quality, accurate work
+every time. But today, that reality depends on the driver of the AI.
+And today, many drivers of AI do not use it well. So, until that
+changes, we need to have strict rules to protect maintainers.
+
+## AI is Welcome Here
+
+This project is accepting of AI assistance, and many maintainers use
+AI tools as a productive part of their workflow. As a project, we
+welcome AI as a tool!
+
+**Our reason for the strict AI policy is not due to an anti-AI stance**, but
+instead due to the number of poor contributions written by AI. It's misuse
+of the tools, not the tools themselves, that is the problem.
+
+This section is included to be transparent about the project's usage of
+AI for people who may disagree with it, and to address the misconception
+that this policy is anti-AI in nature.
+
+## Credits
+
+This policy is adapted and modified from the [Ghostty Project](https://github.com/ghostty-org/ghostty/blob/main/AI_POLICY.md).
+