Sorry, but in my opinion you are in the wrong here.
You can't just offer money and rush people for something to get merged in another open source project without even previously discussing it if the authors of that project want it in the first place.
But then why did you open an issue in the Zig repo and even marked it as "Bug", while in your repo you added the "Enhancement" label?
Just admit that you've communicated it poorly and move on.