LeRobot v0.5.0: Scaling Every Dimension

LeRobot v0.5.0 introduces significant expansions, including support for new hardware like the Unitree G1 humanoid robot for whole-body control. The release adds new policies such as Pi0-FAST autoregressive VLAs and Real-Time Chunking for more responsive inference. It also features major dataset improvements with streaming video encoding to speed up recording and training workflows. Additionally, the update introduces EnvHub for loading simulation environments from the Hugging Face Hub and modernizes the codebase to Python 3.12 and Transformers v5.