Generate tokens only once per voucher, regardless of redemption failures

Use released python-challenge-bypass-ristretto

We should get it from setup.cfg dependencies later

Lower NUM_TOKENS

Adjust to the renaming of privacypass / python-challenge-bypass-ristretto

Runtime performance at 512000 is somewhat intolerable.  Further work is needed to support that scale.

Hard-code larger token count

We don't need to mess with the Python stack limit.  The proof is validated in
Rust.  We just need to offer more stack space to the Rust implementation.

Set up Windows CI

Get rid of the -vvv and give the steps better names

They have no metadata.  They lose information about extras.  They break installation.

So it doesn't squash a failure result from the test suite

no way this works ...