Let's All Agree to Use Seeds as ML-KEM Keys

Yes. Whatever else y'all PQC devs do, please just make this the standard.

If some group wants to manage their seeds by Shamir horcruxing them into ASN.1 encoded shards etched into silver medallions worn under the cloaks of their hooded members, power to them. But when it gets time to load that seed, just have the API take it as an arbitrarily formatted byte string.