Add AI Covenant checklist item to PR template

[mattldawson]

Description of PR purpose/changes

Updates the PR template to include the AI Covenant.

Testing Instructions

N/A

Dev Checklist:

N/A (No code changes)

Updating Version and Release Notes (if applicable)

• Version has been bumped for each release.
• README has been updated for each release.

[Copilot]

Pull request overview

Updates the repository’s pull request template to include an explicit checklist item requiring contributors to acknowledge and follow the project’s AI Covenant, aligning PR submissions with the repo’s responsible AI usage norms.

Changes:

• Adds a new Dev Checklist checkbox linking to /AI_COVENANT.md in the PR template.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.47%. Comparing base (15ba0ef) to head (2b79b46).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #155   +/-   ##
========================================
  Coverage    60.47%   60.47%           
========================================
  Files           64       64           
  Lines         3370     3370           
========================================
  Hits          2038     2038           
  Misses        1332     1332           

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