share one loadTestConfig() helper across the tests

src/test/TestConfig.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include "ConfigLoader.h"
+#include "GameConfig.h"
+
+// Loads the test fixture config set (CONFIG_DIR points at bin/test/data/config
+// for the test target). Shared by every test that needs a full GameConfig, so
+// the one-liner is not repeated per translation unit.
+//
+// Like SimulationTestAccess.h this header lives under src/test and is
+// deliberately off the lib/ui/app include path.
+inline GameConfig loadTestConfig()
+{
+    return ConfigLoader::loadFromDirectory(CONFIG_DIR);
+}