Apple Inc. plans to revamp Siri later this year by turning the digital assistant into the company’s first artificial intelligence chatbot, thrusting the iPhone maker into a generative AI race dominated by OpenAI and Google.The chatbot — code-named Campos — will be embedded deeply into the iPhone, iPad and Mac operating systems and replace the current Siri interface, according to people familiar with the plan. Users will be able to summon the new service the same way they open Siri now, by speaki...