[TEMPLATE] apply ASDF AI Policy

[zacharyburnett]

Description

1. Adds the ASDF AI policy verbatim; here's a diff between STScI AI policy and ASDF AI policy:

6a7
>    2. The use of autonomous AI agents to submit issues, pull requests, or comments is not allowed. Accounts found to be doing so will be banned.
13c14,15
<    2. Committers are encouraged to apply a label of `ai-assisted` to pull requests that leveraged AI tools.
---
>    2. Contributors **must** disclose whether AI was used to assist in the development of a pull request. If so, you must specify which tools were used and how they were used. PRs that do not include this disclosure will be closed.
>    3. Committers are encouraged to apply a label of `ai-assisted` to pull requests that leveraged AI tools.
15,16c17,20
<    1. The pull request process is collaborative and iterative. Contributors are expected to actively engage with reviewer feedback themselves. Copying and pasting replies to / from a generative AI tool does not count as engaging with the reviewer.
<       All pull requests must be reviewed by a human other than the contributor.
---
>    1. AI should not be used to generate comments when communicating with maintainers. Issues and pull requests should be described in your own words. Any use of AI must be disclosed.
>    2. The pull request process is collaborative and iterative. Contributors are expected to actively engage with reviewer feedback themselves. Copying and pasting replies to / from a generative AI tool does not count as engaging with the reviewer.
>    3. If using AI tools for translation, please write in your native language and include the AI translation in a quote block following the original text.
>    4. All pull requests must be reviewed by a human other than the contributor.

2. applies the pull request template from the STScI package template

Tasks

• added entry in CHANGELOG.rst within the relevant release section
• updated or added relevant tests
• updated relevant documentation
• added relevant label(s)

Generative AI Usage Disclosure

no genAI tools used

[zacharyburnett]

splitting template sync off to #253 because we're still waiting for the chief engineers to reach a consensus on an AI policy