fix(v4.3.1): redlining.py — Run 4 delta fixes (A-E)

redlining.py

@@ -435,13 +435,28 @@ _LABEL_KEYWORDS = {
     "Contract by using": ["by using", "continued use", "acceptance"],
 }
 
+# FIX v4.3.1: Exclusion keywords — if ANY of these appear, the clause is rejected for this label.
+# Catches chunks that span two sections (e.g., §12.5 Waiver + §12.6 Non-Solicitation merged into one chunk).
+_LABEL_EXCLUDE_KEYWORDS = {
+    "No-Solicit of Employees": ["waiver of", "waive any", "waives the right", "failure to enforce"],
+    "No-Solicit of Customers": ["waiver of", "waive any", "waives the right", "failure to enforce"],
+    "Non-Disparagement": ["arbitrat", "aaa", "jams", "class action", "waives any right to participate"],
+}
+
 
 def _validate_clause_match(label, clause_text):
-    """FIX v4.3: Validate that a clause actually contains content relevant to its label."""
+    """FIX v4.3.1: Validate clause matches label — checks BOTH required AND excluded keywords."""
+    text_lower = clause_text.lower()
+
+    # Check exclusions first — hard reject
+    exclusions = _LABEL_EXCLUDE_KEYWORDS.get(label, [])
+    if exclusions and any(kw in text_lower for kw in exclusions):
+        return False
+
+    # Check required keywords
     keywords = _LABEL_KEYWORDS.get(label, [])
     if not keywords:
-        return True  # No keywords defined — allow match
-    text_lower = clause_text.lower()
+        return True
     return any(kw in text_lower for kw in keywords)