fix: bind Gradio to 0.0.0.0 so Space is reachable

fix: switch to Docker SDK for full build control

fix: minimal requirements — crewai[tools,litellm] no gradio pin

fix: slim requirements.txt for HF Spaces (remove C-dep heavy packages)

feat: DealFlow AI MVP — 3-agent CrewAI due diligence system on HF Spaces

initial commit