Phase 25.1b: VM undefined-value diagnostics and builder SSA helpers

src/runtime/unified_registry.rs

@@ -52,11 +52,9 @@ pub fn register_user_defined_factory(factory: Arc<dyn crate::box_factory::BoxFac
     let registry = get_global_unified_registry();
     let mut registry_lock = registry.lock().unwrap();
 
-    // Insert at position 1 (after builtin, before plugin)
-    // This maintains priority: builtin > user > plugin
-    if registry_lock.factories.len() >= 2 {
-        registry_lock.factories.insert(1, factory);
-    } else {
-        registry_lock.register(factory);
-    }
+    // Phase 25.1b: delegate to policy-aware register() so that
+    // type_cache is rebuilt and user-defined Box types (HakoCli など)
+    // are correctly advertised to the registry. Priorityは
+    // FactoryPolicy + factory_type に従って決まる。
+    registry_lock.register(factory);
 }