Resolve "sots" referring to both batches and lists of batches

[hanfel-dovned]

Do we even need both batches and lists of batches?

[hanfel-dovned]

Removing the %batch attestation would also let us remove signatures. This points to this being a good thing, since signatures are only useful for submitting an attestation through someone else's transaction without moving your sat, which won't be allowed with confidential comets.