Fix negation operators on arrays to use correct quantifier

For negation operators (IS_NOT, DOES_NOT_CONTAIN, REGEX_DOES_NOT_MATCH),
the match_string method already negates internally. Using any? produced
'at least one element doesn't match' semantics, causing arrays like
['A', 'B'] to match both IS 'A' and IS_NOT 'A' simultaneously.

Changed to use all? for negation operators, ensuring 'all elements
satisfy the negation' (i.e., no element matches the positive condition).

Author: cursoragent

lib/experiment/evaluation/evaluation.rb

@@ -82,7 +82,20 @@ def match_condition(target, condition)
       end
 
       def match_strings_non_set(prop_values, op, filter_values)
-        prop_values.any? { |v| match_string(v, op, filter_values) }
+        if negation_operator?(op)
+          prop_values.all? { |v| match_string(v, op, filter_values) }
+        else
+          prop_values.any? { |v| match_string(v, op, filter_values) }
+        end
+      end
+
+      def negation_operator?(op)
+        case op
+        when Operator::IS_NOT, Operator::DOES_NOT_CONTAIN, Operator::REGEX_DOES_NOT_MATCH
+          true
+        else
+          false
+        end
       end
 
       def get_hash(key)