feat(ui): add comprehensive Quick Start guide to Gradio dashboard

fix(gradio): Share env state with FastAPI to fix 3D Visualizer data tracking

v4 Research Modules & Pre-submission tweaks

v3.0 — Intelligence layer: failure classification, strategy detection, advanced metrics, self-improvement, multi-agent comparison, 3D visualizer

v3.0 — Gradio UI + run_agent.py + full OpenEnv compliance