The weekly Retail Tech Roundup compiles technology news across the supply chain, manufacturing, retail, e-commerce, logistics and fulfillment sectors. Fulfillment Pacsun/Antuit.ai Pacsun partnered with AI-powered demand forecasting and inventory optimization technology provider Antuit.ai to better leverage its stores as e-commerce fulfillment centers. The California-based lifestyle brand says it doubled its completed shipments by better anticipating online…