v4.2: Update README.md

README.md

@@ -10,11 +10,22 @@ app_file: app.py
 pinned: false
 ---
 
-# 🛡️ ClauseGuard v4.0 — World's Best Open-Source Legal Contract Analysis
+# 🛡️ ClauseGuard v4.2 — World's Best Open-Source Legal Contract Analysis
 
 **ClauseGuard** is the most comprehensive open-source AI-powered legal contract analysis tool. It analyzes contracts using state-of-the-art legal NLP models and provides actionable risk assessments, Q&A chatbot, clause redlining, and OCR for scanned PDFs.
 
-## 🆕 What's New in v4.0
+## 🆕 What's New in v4.2
+
+| Feature | Description |
+|---------|-------------|
+| **🔧 NLI Fix** | Fixed contradiction detection — now uses `CrossEncoder.predict()` instead of broken `pipeline("text-classification")` dict input. Contradictions actually work now. |
+| **🔒 Thread Safety** | `BoundedCache` now uses `threading.RLock` to prevent race conditions under concurrent Gradio requests |
+| **⚡ Pre-compiled Regex** | All regex patterns (clause classification, obligations, compliance negation) pre-compiled at module level — eliminates thousands of redundant compilations |
+| **🔗 Extension Fix** | Chrome extension risk formula now matches backend (diminishing returns, not normalized by doc length). Fixed API_BASE URL. |
+| **🏷️ Label Coverage** | Added missing regex-only labels (Indemnification, Confidentiality, Force Majeure, Penalties) to RISK_MAP and DESC_MAP |
+| **🛡️ Security** | API CORS localhost origins now require explicit opt-in via `CORS_ALLOW_LOCALHOST=true` env var |
+
+### Previous: v4.0
 
 | Feature | Description |
 |---------|-------------|