Amazon’s AI-powered shopping assistant, named “Rufus,” is now live for all U.S. customers in the Amazon mobile app, the retailer announced on Friday. The assistant, which lives on the bottom right of the app’s main navigation bar, is designed to offer customers help with finding products, performing product comparisons, and getting recommendations on what to buy. Rufus was initially available in beta only to select customers in the U.S. within the Amazon mobile app ahead of Friday’s launch. Now,...