USDA APHIS (horse import) + FEI international compliance, how does Magento handle it?

Two compliance surfaces matter for international equestrian:

• USDA APHIS, governs live-horse import + adjacent equipment (used tack must be disinfected, biosecurity rules). For a tack store this is largely metadata: tack used on imported horses needs declared origin + disinfection certification. Magento handles via product-attribute (imported_horse_tack) + checkout-step disclosure for cross-border orders.
• FEI (Fédération Équestre Internationale), governs show + competition tack rules. Helmets must meet SEI / ASTM / EN1384 / VG1 standards depending on discipline. Bits must be on the FEI legal-bits list for dressage / show-jumping. Saddles for FEI competitions must meet specific seat / tree rules. Magento attribute: fei_legal (boolean) + discipline_specific (dressage / show-jumping / eventing / endurance). Filter exposes this on every category page so a competition rider can pre-filter to FEI-legal tack.

Add California Prop 65 labels for apparel (leather, dye), supplements (vitamin / mineral content), and stable equipment (treated wood, paint). Magento global config attribute + per-product override + checkout-step disclosure for California ship-to addresses. Penalties for non-disclosure are punitive (~$2,500 per violation).