BAC zero-interest financing: an anchor purchase splits into N monthly
cuota transactions (truncate-to-0.10 rule, last cuota absorbs rounding;
one cuota per 18th-cut billing cycle on the 19th). Pinned against real
Financiamientos data.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
