Update pull request template with AI disclosure section

[IAlibay]

Added section for LLM/AI generated code disclosure in PR template.

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Checklist

• Added a news entry

Developers certificate of origin

• I certify that this contribution is covered by the MIT License here and the Developer Certificate of Origin at https://developercertificate.org/.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.64%. Comparing base (ca330ce) to head (1750c28).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #806   +/-   ##
=======================================
  Coverage   98.64%   98.64%           
=======================================
  Files          43       43           
  Lines        2807     2807           
=======================================
  Hits         2769     2769           
  Misses         38       38           

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[github-actions]

No API break detected ✅

View workflow run

Griffe output

$ griffe check "gufe" -s src --no-inspection --no-color --verbose -a origin/main