Custom harness require setup for `auto`

As per title.

This can be a bit confusing since it is not mentioned as setup.

What happens

1. Set up Manifest, including providers
2. Create a new harness
3. Wire the harness
4. Send request to auto

Expected

Request works

What happens

The harness returns M100.

Opening the URL explains what happens and the additional required setup.

I am unsure if that happens also with pre-configured harnesses.

Suggestion

Add relevant links to documentation so user can set up the default tier after harness creation Better: Add a small extra step for selecting the default tier models