Fail closed on ambiguous import-style enum canonicalization

Stop rewriting OrderEvent.PAY to the machine package when the simple name is ambiguous, and apply the same guard when capping polymorphic events to configured transitions.

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

state_machine_exporter/src/test/java/click/kamil/springstatemachineexporter/analysis/resolver/MachineEnumCanonicalizerCrossPackageTest.java

@@ -1,6 +1,12 @@
 package click.kamil.springstatemachineexporter.analysis.resolver;
 
+import click.kamil.springstatemachineexporter.ast.common.CodebaseContext;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -23,4 +29,39 @@ class MachineEnumCanonicalizerCrossPackageTest {
                 "OrderEvents.PAY", "com.bar.OrderEvents"))
                 .isEqualTo("com.bar.OrderEvents.PAY");
     }
+
+    @Test
+    void shouldNotRewriteImportStyleWhenSimpleNameIsAmbiguous(@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 { CANCEL }");
+
+        CodebaseContext context = new CodebaseContext();
+        context.scan(tempDir);
+
+        assertThat(MachineEnumCanonicalizer.canonicalizeLabel("OrderEvent.PAY", "a.OrderEvent", context))
+                .isEqualTo("OrderEvent.PAY");
+    }
+
+    @Test
+    void shouldNotCapImportStyleWhenSimpleNameIsAmbiguous(@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 { CANCEL }");
+
+        CodebaseContext context = new CodebaseContext();
+        context.scan(tempDir);
+
+        assertThat(MachineEnumCanonicalizer.capToConfiguredTransitionEvents(
+                List.of("OrderEvent.PAY"),
+                List.of("a.OrderEvent.PAY"),
+                "a.OrderEvent",
+                context)).isEmpty();
+    }
 }