SEO is no longer just about Google; it's about AEO (Answer Engine Optimization). Welcome to March 2026. If an AI agent can't "read" your inventory and "negotiate" a checkout in under 200ms, your store doesn't exist. We recently reverse-engineered the top 50 'MACH' (Microservices, API-first, Cloud-native, Headless) stores and found a glaring, common failure point:…