pull_request_template.md

Summary

Closes #

Type of Change

• Bug fix
• New feature
• Refactoring (no behavior change)
• Documentation update
• CI / tooling change

Checklist

• All existing tests pass (dotnet test)
• New behavior is covered by tests
• CHANGELOG.md updated under [Unreleased]
• XML doc comments added/updated for any new public members
• Build passes with no new warnings (dotnet build -c Release)

Notes for Reviewer