feat: Add pi support #43

What problem are you trying to solve?

I really enjoyed the tool. This is something I have been looking for ages.

I would love to be able to be flexible and use different models to review the code.

What would you like to see?

I really enjoyed the tool. This is something I have been looking for ages.

I'd love to see https://pi.dev/ support instead of just claude code, or directly API support from different model vendors