Add Pull Request template

[JosephDoUrden]

Summary

Add a PR template to standardize pull request descriptions and ensure contributors follow a checklist.

What needs to be done

• Create .github/PULL_REQUEST_TEMPLATE.md with:
  • Description section
  • Type of change (bug fix, feature, docs, refactor, CI)
  • Checklist (build, tests, changelog)

Acceptance Criteria

• New PRs auto-populate with the template
• Template includes a checklist for quality gates