Fix Space pip resolve: fastapi>=0.115.2, python-multipart>=0.0.18, pin gradio 5.50.0.

Pin Gradio >=5.7.1 for huggingface_hub 1.x (fixes HfFolder ImportError on Space).

Ship polished Space UI with Gradio dashboard and evidence-rich demo.

Deploy: SOTA RL Cartesian Task and Unsloth Scripts

Initial OpenEnv SQL debug environment