Deploy harness v2 to root for HuggingFace Space

Archive harness v1, update docs for v0.04 paper and harness v2

Add Current Limitations & Roadmap section with enhancement priorities

Add interactive data report link to demo header

Add iteration 0 (100%) and improve demo signals for better results

Fix recursion_test result handling - extract fidelities from dict

Fix import - use extract_hard_commitments from extraction.py

Add Gradio Space demo with side-by-side comparison