The news came by Slack message. Cruise CEO Marc Whitten, who took the top post in June, posted a message Tuesday afternoon in the company’s announcements channel along with a link to a press release entitled “GM to refocus autonomous driving development on personal vehicles.” GM, which acquired the self-driving car startup in 2016, would no longer fund the company, ending a mission that hundreds of Cruise engineers had worked on for years. Minutes later, during an all-hands meeting, Cruise emplo...