studies/CONTRIBUTING.md

Add a package

1. Create models/<id>/ with book/, code-study/, reference/, derived/, scripts/, Makefile, README.md
2. scripts/generate_derived.py must write derived/summary.json with: model_id, display_name, status, context_tokens, generated_at_utc, total_params, active_params
3. Register in models/registry.json
4. Offline: stdlib only — no pip, no network in generate/validate
5. make test or python3 run.py test from studies/

Refresh scripts may use curl (online only).