housekeeping(server): clean too-broad visibility markers and organize imports

server/crates/arbiter-crypto/src/hashing.rs

@@ -1,6 +1,7 @@
-pub use hmac::digest::Digest;
 use std::collections::HashSet;
 
+pub use hmac::digest::Digest;
+
 /// Deterministically hash a value by feeding its fields into the hasher in a consistent order.
 #[diagnostic::on_unimplemented(
     note = "for local types consider adding `#[derive(arbiter_macros::Hashable)]` to your `{Self}` type",