Bump to gradio 6.13.0 + unpin huggingface_hub

Bump to gradio 5.6.0 (modern, fixes schema bool bug)

Pin Python 3.12 + torch 2.7.1 + mmcv 2.2.0 (verified locally)

Pin Python 3.10 + torch 2.1.2; vendor sapiens2 to bypass requires-python

Initial sapiens2-pose Space (HF download at startup, all 4 sizes)

initial commit