Ed25519 from/to bytes#3608
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Production validators need to load persistent keys from files. `from_seed(u64)` is explicitly test-only, and while `Decode` works for raw-bytes construction it is semantically a codec concept, not key construction. Add two ergonomic methods: - `from_bytes([u8; 32])` — construct from a 32-byte Ed25519 seed - `to_bytes() -> Zeroizing<[u8; 32]>` — export the seed (auto-zeroized) Both are thin wrappers matching the existing Read/Write impls but with clearer intent. Includes 5 tests: roundtrip, RFC 8032 vector, Decode equivalence, Encode equivalence, and sign/verify after roundtrip.
… ed25519-from-to-bytes
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