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Critical Bug Fix

The entire Gradio UI section was accidentally deleted during the PR #3 upload (v4.2 bug fixes). The app.py file contained all the model loading, analysis, and rendering code but was missing:

1. run_comparison() function — wrapper for the comparison tab
2. process_upload() function — file upload handler
3. run_analysis() function — main analysis pipeline wrapper that generates exports and calls redlining
4. Example contracts — SPOTIFY_TOS, RENTAL_AGREEMENT, NDA_SAMPLE, COMPLEX_CONTRACT
5. The entire gr.Blocks() UI — all tabs, buttons, inputs, outputs, event handlers
6. demo.launch() — the actual app launch

Without these, the Space loaded all 3 ML models (ONNX classifier + NER + NLI) into memory but then had nothing to render, so Gradio never started and the Space appeared broken.

Root cause

PR #3 uploaded a truncated app.py (1469 lines) that was missing lines 1470-1862 containing the Gradio UI. The original v4.0 had 1564 lines with the UI section starting at line 1319.

What this PR restores

• All missing functions and example data
• Complete Gradio Blocks UI with 3 tabs (Analysis, Compare, Q&A Chatbot)
• All event handlers (load, analyze, clear, compare)
• Updated footer links to reference v4.3 models (ONNX INT8, BGE embeddings)
• if __name__ == "__main__": demo.launch() guard

Files changed

• app.py — restored ~393 lines of missing Gradio UI code