Apple Inc.’s turmoil in its AI division reached new heights on Friday, with the company delaying promised updates to the Siri digital assistant for the foreseeable future. Apple said that features introduced last June, including Siri’s ability to tap into a user’s personal information to answer queries and have more precise control over apps, will now be released sometime in “the coming year.” The iPhone maker hadn’t previously set a public deadline for the capabilities, but they were initially ...