In recent months, a slew of top executives at Boston Dynamics have left the company, which Hyundai bought a majority stake in back in 2021. It’s notable timing: The robotics company is working toward an IPO and talking about opening up new production facilities.CEO Robert Playter retired in February, followed by the company’s chief operating and chief strategy officers. CTO Aaron Saunders defected to Google DeepMind, and other robotics researche…