chore: import upstream snapshot with attribution

tests/fixtures/sample.cpp

@@ -0,0 +1,55 @@
+#include <iostream>
+#include <string>
+#include <vector>
+
+class HttpClient {
+public:
+    HttpClient(const std::string& baseUrl) : baseUrl_(baseUrl) {}
+
+    std::string get(const std::string& path) {
+        return buildRequest("GET", path);
+    }
+
+    std::string post(const std::string& path, const std::string& body) {
+        return buildRequest("POST", path);
+    }
+
+private:
+    std::string baseUrl_;
+    std::vector<std::string> tags_;
+
+    std::string buildRequest(const std::string& method, const std::string& path) {
+        return method + " " + baseUrl_ + path;
+    }
+};
+
+class AuthedHttpClient : public HttpClient {
+public:
+    AuthedHttpClient(const std::string& baseUrl, const std::string& token)
+        : HttpClient(baseUrl), token_(token) {}
+
+private:
+    std::string token_;
+};
+
+struct RetryingHttpClient : HttpClient {
+    int maxRetries;
+};
+
+template <typename T>
+class Connection {
+public:
+    T resource;
+};
+
+class PooledClient : public Connection<HttpClient> {
+public:
+    int poolSize;
+};
+
+int main() {
+    HttpClient client("https://api.example.com");
+    std::string response = client.get("/users");
+    std::cout << response << std::endl;
+    return 0;
+}