Fail closed on ambiguous simple enum names

Track enum name collisions during scan and refuse to resolve enum values by simple name when multiple enums share the same identifier across packages.

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

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

@@ -231,6 +231,25 @@ class CodebaseContextTest {
         assertThat(context.findEntryPointClasses(List.of("EnableStateMachine"))).isEmpty();
     }
 
+    @Test
+    void getEnumValuesShouldFailClosedForAmbiguousSimpleEnumName() throws IOException {
+        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);
+
+        assertThat(context.getEnumValues("OrderEvent"))
+                .as("ambiguous simple enum name must not resolve to arbitrary package")
+                .isNull();
+        assertThat(context.getEnumValues("a.OrderEvent")).containsExactly("a.OrderEvent.PAY");
+        assertThat(context.getEnumValues("b.OrderEvent")).containsExactly("b.OrderEvent.SHIP");
+    }
+
     @Test
     void shouldFindClassWithFullyQualifiedAnnotation() throws IOException {
         String source = """