Feature Request: Add optional Instructions to settings or config

What version of the VS Code extension are you using?

0.4.38

What subscription do you have?

Pro

Which IDE are you using?

VS Code

What platform is your computer?

_No response_

What issue are you seeing?

GPT-5 has odd habits like adding unnecessary enviornmental variables or leading every variable/function with an underscore. I'd love a way to add some additional instruction to each request payload on the backend that attaching these rules of "Don't start each variable with an understore" etc. So that I don't need to continously do this before each request.

What steps can reproduce the bug?

Feature does not exist yet.

What is the expected behavior?

_No response_

Additional information

_No response_