Add AI policy

[danielfromearth]

This change adds an AI policy document (copied from SciPy) to clarify responsibilities, disclosure, code quality, copyright, communication, and use of AI agents. This is an outgrowth of the AI guidance, contributions, automations (PR #1294) discussion.

Description

---

"Ready for review" checklist

• Place this Pull Request (PR) in draft until it is ready for review (see below)
• Please review our Pull Request Guide
• Mark "ready for review" after following instructions in the guide

Merge checklist

• PR title is descriptive
• PR body contains links to related and resolved issues (e.g. closes #1)
• If needed, CHANGELOG.md updated
• If needed, docs and/or README.md updated
• If needed, unit tests added (unsure how? see below!)
• All checks passing (tip: comment pre-commit.ci autofix if pre-commit is failing)
• At least one approval

Need help? We welcome contributions at every experience level. You don't have to
write tests alone — open your PR and ask for help. It's also fine to let GitHub run tests
for you, via Continuous Integration (CI),
instead of running them locally. If anything fails and you're not sure why, just
mention @earthaccess-dev/maintainers in a comment and we'll work with you!

[github-actions]

👈 Launch a binder notebook on this branch for commit 4a8b13d

I will automatically update this comment whenever this PR is modified

👈 Launch a binder notebook on this branch for commit 8da5f52

[danielfromearth]

pre-commit.ci autofix

[Sherwin-14]

AI Contribution Policy Reference

⭐ = the good stuff   |   📌 Compiled from open-source-ai-contribution-policies

Project	Home Page	Policy	Disclosure Required	Copyright Statement	Review
Apache Airflow	Homepage	Policy	Yes	Yes
Apache DataFusion	Homepage	Policy	No	No
attrs	Homepage	Policy	?	Yes	⭐
conda	Homepage	Policy	No	Yes
CPython	Homepage	Policy	No	No
CuPy	Homepage	Policy	No	No
Django	Homepage	Policy	Yes	No
dlt	Homepage	Policy	No	No
FastAPI	Homepage	Policy	No	No	⭐
Matplotlib	Homepage	Policy	Yes	No	⭐
MicroPython	Homepage	Policy	No	No
napari	Homepage	Policy	Yes	No
NumPy	Homepage	Policy	Yes	Yes
pip	Homepage	Policy	No	Yes
pip-tools	Homepage	Policy	No	No
PyTorch	Homepage	Policy	No	No
PyVista	Homepage	Policy	No	No
qutip	Homepage	Policy	Yes	Yes	⭐
scikit-learn	Homepage	Policy	Yes	No
SciPy	Homepage	Policy	Yes	Yes	⭐
STAC	Homepage	Policy	Yes	No	⭐
SymPy	Homepage	Policy	Yes	Yes	⭐
Wagtail	Homepage	Policy	Yes	No
WP1	Homepage	Policy	No	No
Zulip	Homepage	Policy	No	Yes