Checkpoint 2: integrate native Editor, MCP, gameplay builds and standalone export

examples/tutorials/spawning/Gameplay.hpp

@@ -0,0 +1,7 @@
+#pragma once
+#include <faset/runtime/Runtime.hpp>
+
+namespace faset::gameplay {
+void registerGameplay(runtime::Runtime& world);
+nlohmann::json schema();
+} // namespace faset::gameplay