pull_request_template.md

What changed

Why

How tested

• All existing tests pass (pytest tests/)
• New tests added (if applicable)

Type of change

• Bug fix
• New feature
• Breaking change
• Documentation
• Refactoring / CI / tooling

Breaking changes

Checklist

• Code follows project style (ruff check . && ruff format --check .)
• Self-review completed
• Version bumped if needed (pyproject.toml, templates, docs)