feat(mcp): Finalize C/C++ AST tools with robust testing and bug fixes

tests/assets/gencpp_samples/component_registry.cpp

@@ -0,0 +1,26 @@
+#include "component_registry.h"
+#include <iostream>
+
+namespace gencpp {
+namespace registry {
+
+ComponentRegistry& ComponentRegistry::Instance() {
+    static ComponentRegistry instance;
+    return instance;
+}
+
+void ComponentRegistry::Register(const std::string& type, ComponentCreator creator) {
+    std::cout << "Registering component type: " << type << std::endl;
+    m_creators[type] = creator;
+}
+
+std::unique_ptr<core::BaseComponent<void*>> ComponentRegistry::Create(const std::string& type) {
+    auto it = m_creators.find(type);
+    if (it != m_creators.end()) {
+        return it->second();
+    }
+    return nullptr;
+}
+
+} // namespace registry
+} // namespace gencpp