pull_request_template

Summary

What this PR does, in one or two sentences.

Related

• Closes # (issue number)
• Bead(s): school-core-xxxx

Testing

• python -m pytest -q -m "not live" passes
• python -m compileall -q -x "school-output" . passes
• ruff check (core modules) passes
• python scripts/sanitize_data.py --verify passes (if data/ touched)

Notes for reviewers

Anything non-obvious: environment needs, privacy implications, off-suite paths exercised.