Unitree Go2 velocity-tracking locomotion policy.

Source: rl_sar, https://github.com/fan-ziqi/rl_sar
        policy/go2/robot_lab/policy.pt at commit 376d42c9b128f963ab08579762d5a216a976ce39
        (trained with robot_lab, https://github.com/fan-ziqi/robot_lab)
Copyright (c) 2024-2025 Ziqi Fan
License: Apache-2.0 (see LICENSE)

policy.onnx is the TorchScript actor exported with torch.onnx.export (opset 17),
input "obs" (1, 45) float32, output "actions" (1, 12) float32.
config.yaml and base.yaml are the source's deployment configs that define the
observation layout, scales, default joint positions, PD gains and joint order.
