[Bug]: ClassifierOutput's 'prediction' has incorrect type

[hijohnnylin]

The ClassifierOutput's prediction type shows bool, but when it is used, it's assigned an int of either -1, 0, or 1. The -1 case I think means that there was some error in predicting.

We should decide on:

1. Make it a bool or not
2. What to do with the error case (consider it false? maybe create a specific type with 3 states?)

Would be good for the solution to be somewhat backward compatible.

sae-auto-interp/sae_auto_interp/scorers/classifier/sample.py

Line 32 in 3659ff3

prediction: bool = False