Hugging Face releases LeRobot v0.4.0 with major simulation and VLA upgrades

Evidence notes

• Hugging Face released LeRobot v0.4.0 with updated datasets, simulation support, new VLA models, a hardware plugin system, and a robot-learning course.
• The release added support for LIBERO and Meta-World, multi-GPU training improvements, and broader real-world hardware integration.
• The release advances the open robot-learning stack with reusable tooling for simulation, VLA training, datasets, and hardware integration.