Looking for feedbacks on a Noise Protocol implementation

Hello everyone ! I have been working on this Noise protocol implementation in Rust for a few months (previously on a separate repo) and I would love to have your feedback on its API. The idea is to check at compile-time that the pattern, role, and ciphersuite are valid, as well as ensuring that all required keys have been provided. For the keys, I am using const assertions in the build() method as it allows me to provide better error messages than I would get from using a typestate pattern al...