Defer polymorphic qualification to linker with context

Stop rewriting polymorphic events in TriggerPoint construction without ambiguity context; canonicalize labels at link time while preserving type FQNs for shared-infrastructure routing.

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

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

@@ -1,5 +1,6 @@
 package click.kamil.springstatemachineexporter.analysis.resolver;
 
+import click.kamil.springstatemachineexporter.analysis.model.TriggerPoint;
 import click.kamil.springstatemachineexporter.ast.common.CodebaseContext;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
@@ -64,4 +65,31 @@ class MachineEnumCanonicalizerCrossPackageTest {
                 "a.OrderEvent",
                 context)).isEmpty();
     }
+
+    @Test
+    void shouldCanonicalizeLabelsForLinkingWithoutOverwritingTypeFqns(@TempDir Path tempDir) throws Exception {
+        Files.createDirectories(tempDir.resolve("com/example/order"));
+        Files.writeString(tempDir.resolve("com/example/order/OrderEvent.java"),
+                "package com.example.order; public enum OrderEvent { PAY, SHIP }");
+        Files.writeString(tempDir.resolve("App.java"), "package com.example; class App {}");
+
+        CodebaseContext context = new CodebaseContext();
+        context.scan(tempDir);
+
+        TriggerPoint trigger = TriggerPoint.builder()
+                .event("OrderEvent.valueOf(action)")
+                .polymorphicEvents(List.of("OrderEvent.PAY", "OrderEvent.SHIP"))
+                .build();
+        StateMachineTypeResolver.MachineTypes types = new StateMachineTypeResolver.MachineTypes(
+                "com.example.order.OrderState", "com.example.order.OrderEvent");
+
+        TriggerPoint linked = MachineEnumCanonicalizer.canonicalizeTriggerLabelsForLinking(
+                trigger, types, context);
+
+        assertThat(linked.getEventTypeFqn()).isNull();
+        assertThat(linked.getStateTypeFqn()).isNull();
+        assertThat(linked.getPolymorphicEvents()).containsExactly(
+                "com.example.order.OrderEvent.PAY",
+                "com.example.order.OrderEvent.SHIP");
+    }
 }