pull_request_template.md

What does this PR do?

Type of change

• Bug fix
• New feature
• Refactor / cleanup
• Documentation
• Tests

Checklist

• ruff check src/soup_cli/ scripts/ tests/ passes
• pytest tests/ -v passes
• Updated relevant docs (README.md and the matching page under docs/) if needed
• Added a changelog fragment, or this change has no user-visible impact