Luraph/luraph-dotnet ? reverse-engineered prompt

Build me a clean .NET SDK for the Luraph API that lets a C# app talk to the service easily.

I want it to handle the full flow for obfuscating a script, starting with getting the available nodes, then creating a new job, checking the job status, and downloading the result when it is done. It should also expose the response models and error handling in a simple way so someone using the library can see what went wrong without digging through raw API responses.

Please make it feel like a real usable package, with good defaults, clear method names, and an example in the test app that shows how to authenticate with an API key and run the process end to end. If there are any current API details that are unclear, look up the latest docs online and match them. Keep it straightforward and easy for a normal C# developer to use in a few lines of code.