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

scripts/curated-snippets/magic_enum.cpp

@@ -0,0 +1,10 @@
+#include <magic_enum/magic_enum.hpp>
+import std;
+
+enum class Color { Red, Green, Blue };
+
+int main() {
+    auto n = magic_enum::enum_count<Color>();
+    std::println("magic_enum ok: {} entries", n);
+    return 0;
+}