fix(call): remove dead test helper and unused mut (clippy -D warnings clean)

crates/alknet-call/src/protocol/adapter.rs

@@ -532,7 +532,7 @@ mod tests {
         );
         let provider: Arc<dyn IdentityProvider> = Arc::new(StaticIdentityProvider::new());
         let adapter = CallAdapter::new(registry, provider);
-        let mut conn = CallConnection::new(stub_connection());
+        let conn = CallConnection::new(stub_connection());
         let imported = HandlerRegistration::new(
             OperationSpec::new(
                 "worker/exec",
@@ -598,7 +598,7 @@ mod tests {
         );
         let provider: Arc<dyn IdentityProvider> = Arc::new(StaticIdentityProvider::new());
         let adapter = CallAdapter::new(registry, provider);
-        let mut conn = CallConnection::new(stub_connection());
+        let conn = CallConnection::new(stub_connection());
         let imported = HandlerRegistration::new(
             OperationSpec::new(
                 "worker/exec",

crates/alknet-call/src/protocol/dispatch.rs

@@ -403,18 +403,6 @@ mod tests {
         )
     }
 
-    fn internal_spec(name: &str, acl: AccessControl) -> OperationSpec {
-        OperationSpec::new(
-            name,
-            OperationType::Query,
-            Visibility::Internal,
-            serde_json::json!({}),
-            serde_json::json!({}),
-            vec![],
-            acl,
-        )
-    }
-
     fn registry_with(name: &str, visibility: Visibility, acl: AccessControl) -> OperationRegistry {
         let mut registry = OperationRegistry::new();
         registry.register(HandlerRegistration::new(