Remove membership classes (spec, registry schema, enforcement); no roles or tiers

tests/federation.rs

@@ -106,10 +106,9 @@ fn registry_doc(
     )
 }
 
-fn member(id: &str, key: &Keypair, class: &str) -> RegistryMember {
+fn member(id: &str, key: &Keypair) -> RegistryMember {
     RegistryMember {
         id: id.to_string(),
-        class: class.to_string(),
         keys: vec![KeyEntry {
             key: key.public_hex(),
             not_before: 0,
@@ -129,7 +128,7 @@ async fn relay_admission_gates_unlisted_keys() {
         &registry_path,
         &registry_doc(
             &ma,
-            vec![member("alice.frx.example", &alice, "source")],
+            vec![member("alice.frx.example", &alice)],
             vec![],
             1,
         ),
@@ -187,8 +186,8 @@ async fn node_discovers_relays_from_registry() {
         &registry_doc(
             &ma,
             vec![
-                member("alice.frx.example", &alice, "source"),
-                member("bob.frx.example", &bob_config.load_key().unwrap(), "source"),
+                member("alice.frx.example", &alice),
+                member("bob.frx.example", &bob_config.load_key().unwrap()),
             ],
             vec![relay_url.clone()],
             1,