Startup Figure AI is developing general-purpose humanoid robots.Figure AIFigure AI, an Nvidia-backed developer of humanoid robots, was sued by the startup's former head of product safety who alleged that he was wrongfully terminated after warning top executives that the company's robots "were powerful enough to fracture a human skull."Robert Gruendel, a principal robotic safety engineer, is the plaintiff in the suit filed Friday in a federal court in the Northern District of California. Gruendel...