An AI just read a stranger's mind through their skull, no surgery, no implants, and got roughly 45% of the meaning right on the first try. On a person it had never seen before. That's the tech an OpenAI researcher just quit her job for. Two weeks ago she walked out of the hottest company on earth to join Conduit, a startup collecting brain recordings in a San Francisco basement. Here's what happens in that basement. Paid volunteers put on four pound headsets covered in sensors and chat with…