Apple’s Worldwide Developer Conference on Monday started off with an apology of sorts. Instead of jumping right into the headline news about a revamped AI-powered Siri , Apple’s senior vice president of Software Engineering, Craig Federighi spent the first stretch of the keynote on a list of repairs. For the past two years, Apple has been racing to catch up in AI while frustrations with its core software quietly added up: a design overhaul users hated, a search function that barely worked, a