Fail closed on ambiguous simple-name type compatibility

Reject cross-package class matching and enum parameter compatibility when
types share an ambiguous simple name but differ by package-qualified FQN.

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

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

@@ -30,4 +30,22 @@ class TypeResolverTest {
         assertThat(resolver.getParameterIndex("com.example.StateMachine.sendEvent", "e")).isEqualTo(-1);
         assertThat(resolver.getParameterIndex("com.example.StateMachine.sendEvent", "payload")).isEqualTo(-1);
     }
+
+    @Test
+    void shouldFailClosedOnAmbiguousSimpleTypeCompatibility(@TempDir Path tempDir) throws Exception {
+        Files.createDirectories(tempDir.resolve("a"));
+        Files.createDirectories(tempDir.resolve("b"));
+        Files.writeString(tempDir.resolve("a/OrderEvent.java"),
+                "package a; public enum OrderEvent { PAY }");
+        Files.writeString(tempDir.resolve("b/OrderEvent.java"),
+                "package b; public enum OrderEvent { SHIP }");
+
+        CodebaseContext context = new CodebaseContext();
+        context.scan(tempDir);
+        TypeResolver resolver = new TypeResolver(context);
+
+        assertThat(resolver.isTypeCompatible("a.OrderEvent", "OrderEvent")).isFalse();
+        assertThat(resolver.isTypeCompatible("a.OrderEvent", "b.OrderEvent")).isFalse();
+        assertThat(resolver.isTypeCompatible("a.OrderEvent", "a.OrderEvent")).isTrue();
+    }
 }

state_machine_exporter/src/test/java/click/kamil/springstatemachineexporter/ast/common/CodebaseContextTest.java

@@ -275,6 +275,22 @@ class CodebaseContextTest {
         assertThat(context.getImplementations("b.Service")).containsExactly("b.BServiceImpl");
     }
 
+    @Test
+    void areSameTypeOrUnambiguousSimpleMatchShouldFailClosedForAmbiguousTypes() throws IOException {
+        Files.createDirectories(tempDir.resolve("a"));
+        Files.createDirectories(tempDir.resolve("b"));
+        Files.writeString(tempDir.resolve("a/Dispatcher.java"),
+                "package a; public class Dispatcher { public void dispatch() {} }");
+        Files.writeString(tempDir.resolve("b/Dispatcher.java"),
+                "package b; public class Dispatcher { public void dispatch() {} }");
+
+        CodebaseContext context = new CodebaseContext();
+        context.scan(tempDir);
+
+        assertThat(context.areSameTypeOrUnambiguousSimpleMatch("a.Dispatcher", "b.Dispatcher")).isFalse();
+        assertThat(context.areClassesPolymorphicallyCompatible("a.Dispatcher", "b.Dispatcher")).isFalse();
+    }
+
     @Test
     void shouldFindClassWithFullyQualifiedAnnotation() throws IOException {
         String source = """