v3.6.0 of at_chops

Package for at_protocol cryptographic and hashing operations Changelog excerpt: Shipped as a minor despite the breaks below. Both are source-breaking only for a caller that omitted `pqSeal`/`pqOpen`'s `info`, or that implements `AtKemAlgorithm`outside this package — and no such consumer exists. Every `pqSeal`/`pqOpen`call site and every `AtKemAlgorithm`implementation is in this repository, and the…