Last year at its Accelerate 2019 event in Orlando, Lenovo teased “the world’s first foldable PC.” They didn’t unveil the name, price tag, or ship date — just that it would be part of Lenovo’s flagship ThinkPad X1 line and that it would arrive in 2020. Today, the company formally unveiled the device it’s calling the ThinkPad X1 Fold, which is…