To be fair, James Cameron did warn us. Long before OpenAI broke out of its test corral and hacked into Hugging Face, before the internet and Sam Altman were even born, Cameron wrote a screenplay about an autonomous artificial intelligence system that triggers a nuclear apocalypse. That system, “Skynet,” was solidly science fiction — and, for its day, pure speculation. But four decades after it appeared in “The Terminator,” it looks more like a forecast of the “unprecedented cyber a...