v4.3 perf: Update compare.py

🔧 v4.2: Critical bug fixes + performance optimizations (7 bugs, 4 perf improvements) (#3)

fix: upload actual compare.py content with all v4.1 fixes

🛡️ v4.1: Fix all critical bugs, security issues, and performance problems (#2)

v3.1: Fix 9-10 — cross-domain detection, higher similarity threshold, contract type gate

v3.0: Upload actual compare.py content

v3.0: Fix comparison engine - add semantic similarity via sentence-transformers

Upload compare.py