# Documenter — F-010 Variants, SKU/EAN and product rich data

done -> work/artifacts/F-010/documenter.md

## Documentation updated
- `project/README.md`

## Covered
- Product variant error code `PRODUCT_VARIANT_CODE_EXISTS`.
- Variant endpoints under `/products/:id/variants`.
- Rich data endpoint `/products/:id/rich-data`.
- Variant SKU/EAN uniqueness.
- Nutrition provenance sources: `manual`, `manufacturer`, `openfoodfacts`.
- Manual nutrition protection from external-source overwrites.
- Explicit out-of-scope note: no stock, prices, images, or external sync job.

## Verification
- `cd project && npm run lint` — PASS after README Prettier normalization.
- `./scripts/verify.sh` — PASS from repository root before documentation close.
