External stair-climbing paper trains and transfers policies on Unitree Go2

Evidence notes
- The paper studies a two-stage reinforcement-learning approach for improving quadruped performance on U-shaped stair climbing.
- The training robot-dog modality is Unitree Go2, first trained in Isaac Lab and then transferred to U-shaped indoor staircase climbing.
- The work gives Go2 a directly named benchmark for stair-climbing policy transfer from Isaac Lab to real hardware.
Company context
Develops quadruped and humanoid robots, with strength in dynamic locomotion, vertically integrated hardware, and relatively low-cost commercial deployment. Unitree is one of the clearest examples of a legged robotics company moving from research visibility into real productisation and broader market distribution.