chore: import upstream snapshot with attribution

src/main.cpp

@@ -0,0 +1,46 @@
+/*!
+ * Copyright (c) 2016-2026 Microsoft Corporation. All rights reserved.
+ * Copyright (c) 2016-2026 The LightGBM developers. All rights reserved.
+ * Licensed under the MIT License. See LICENSE file in the project root for license information.
+ */
+#include <LightGBM/application.h>
+
+#include <iostream>
+#include <string>
+
+#ifdef USE_MPI
+  #include "network/linkers.h"
+#endif
+
+int main(int argc, char** argv) {
+  bool success = false;
+  try {
+    LightGBM::Application app(argc, argv);
+    app.Run();
+
+#ifdef USE_MPI
+    LightGBM::Linkers::MpiFinalizeIfIsParallel();
+#endif
+
+    success = true;
+  }
+  catch (const std::exception& ex) {
+    std::cerr << "Met Exceptions:" << std::endl;
+    std::cerr << ex.what() << std::endl;
+  }
+  catch (const std::string& ex) {
+    std::cerr << "Met Exceptions:" << std::endl;
+    std::cerr << ex << std::endl;
+  }
+  catch (...) {
+    std::cerr << "Unknown Exceptions" << std::endl;
+  }
+
+  if (!success) {
+#ifdef USE_MPI
+    LightGBM::Linkers::MpiAbortIfIsParallel();
+#endif
+
+    exit(-1);
+  }
+}