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

tests/assets/gencpp_samples/complex_template.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include <tuple>
+#include <utility>
+
+namespace gencpp {
+namespace util {
+
+/**
+ * @brief A complex template class demonstrating variadic templates.
+ */
+template <typename... Args>
+class MultiBuffer {
+public:
+    void SetData(Args... args) {
+        m_data = std::make_tuple(args...);
+    }
+
+    template <size_t I>
+    auto Get() const -> const typename std::tuple_element<I, std::tuple<Args...>>::type& {
+        return std::get<I>(m_data);
+    }
+
+private:
+    std::tuple<Args...> m_data;
+};
+
+/**
+ * @brief Template specialization example.
+ */
+template <typename T>
+struct TypeTraits {
+    static constexpr bool IsPointer = false;
+};
+
+template <typename T>
+struct TypeTraits<T*> {
+    static constexpr bool IsPointer = true;
+};
+
+/**
+ * @brief Nested template class.
+ */
+template <typename Outer>
+struct Container {
+    template <typename Inner>
+    struct Wrapper {
+        Inner value;
+        Outer context;
+    };
+};
+
+} // namespace util
+} // namespace gencpp