The Slack messages began arriving at 5:47 a.m. on a recent Monday. Three sales proposals had gone out the previous week and none of the team members had scheduled follow-ups. The reminders were crisp, professional and relentless — and they hadn’t been sent by a human. They came from Junior, an AI employee from the startup Kuse AI. Xiankun Wu, the company’s founder, is creating the kind of workplac...