[M5] verify-curated-db.sh + boost recipe (header-only)

scripts/curated-snippets/cli11.cpp

@@ -0,0 +1,13 @@
+#include <CLI/CLI.hpp>
+import std;
+
+int main(int argc, char** argv) {
+    CLI::App app{"verify"};
+    try {
+        app.parse(argc, argv);
+    } catch (const CLI::ParseError& e) {
+        return app.exit(e);
+    }
+    std::println("cli11 ok");
+    return 0;
+}