Serve via Gradio demo.launch() on HF Spaces (uvicorn.run fought the platform's own port-7860 server)

Pin uvicorn to workers=1 (prevents WEB_CONCURRENCY-driven double bind on port 7860)

Fix ZeroGPU shim: stop pinning spaces in requirements.txt (Spaces injects its own build)

Add ZeroGPU compatibility shim (Space hardware is locked to ZeroGPU, no PRO downgrade available)

Add self-bootstrap for free Gradio-SDK Spaces (Docker SDK now requires payment)

Placement Policy RAG chatbot