fix: use correct trace log key (detail not message)

Author: LalaSkye

tests/test_gate_conformance.py

@@ -154,7 +154,7 @@ def test_gate_verdict_logged(self, contaminated_case_1):
         trace = self.logger.get_trace()
         gate_events = [e for e in trace if e["event"] == "GATE"]
         assert len(gate_events) >= 1
-        assert "DENY" in gate_events[0]["message"]
+        assert "DENY" in gate_events[0]["detail"]
 
 
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