Add parity test for DTO field access

Ensures public field access (req.type) flows into sendEvent() consistently between heuristic and JDT call-graph engines.

Co-authored-by: Cursor <cursoragent@cursor.com>

state_machine_exporter/src/test/java/click/kamil/springstatemachineexporter/analysis/service/JdtCentralDispatcherParityTest.java

@@ -114,6 +114,37 @@ class JdtCentralDispatcherParityTest {
                 .containsExactlyInAnyOrderElementsOf(heuristicShip.getTriggerPoint().getPolymorphicEvents());
     }
 
+    @Test
+    void jdtShouldMatchHeuristicForPublicDtoFieldAccess(@TempDir Path tempDir) throws Exception {
+        String source = """
+            package com.example;
+            public class ApiController {
+                CommandGateway gateway;
+                public void submit() { gateway.submit(new OrderRequest(OrderEvent.SUBMIT)); }
+            }
+            class CommandGateway {
+                void submit(OrderRequest req) {
+                    StateMachine sm = new StateMachine();
+                    sm.sendEvent(req.type);
+                }
+            }
+            class OrderRequest {
+                public final OrderEvent type;
+                OrderRequest(OrderEvent type) { this.type = type; }
+            }
+            enum OrderEvent { SUBMIT, PAY }
+            class StateMachine { public void sendEvent(OrderEvent e) {} }
+            class OrderStateMachineConfig {}
+            """;
+        CodebaseContext context = scanSource(source, tempDir);
+
+        CallChain heuristic = resolveChain(context, CONTROLLER, "submit", STATE_MACHINE, EngineKind.HEURISTIC);
+        CallChain jdt = resolveChain(context, CONTROLLER, "submit", STATE_MACHINE, EngineKind.JDT);
+
+        assertThat(jdt.getTriggerPoint().getPolymorphicEvents())
+                .containsExactlyInAnyOrderElementsOf(heuristic.getTriggerPoint().getPolymorphicEvents());
+    }
+
     @Test
     void jdtShouldMatchHeuristicForDtoCrossHop(@TempDir Path tempDir) throws Exception {
         String source = """