Phase B: identifier+key on the wire, JCS envelope signing (FRX/0.5), registry binding

tests/phase1.rs

@@ -2,9 +2,9 @@ mod common;
 
 use std::fs;
 
-use common::{ask, client, collection, config_for, publish, spawn_relay};
+use common::{ask, client, collection, config_for, publish, spawn_relay, test_envelope};
 use frxd::index::LocalIndex;
-use frxd::message::{EXPOSURE_FULL, Envelope, TYPE_RESPONSE};
+use frxd::message::{EXPOSURE_FULL, TYPE_RESPONSE};
 use frxd::node::Node;
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 4)]
@@ -106,7 +106,7 @@ async fn two_node_broadcast_query_flow() {
 async fn relay_rejects_non_query_broadcasts() {
     let relay_url = spawn_relay().await;
     let key = frxd::crypto::Keypair::generate();
-    let envelope = Envelope::new(
+    let envelope = test_envelope(
         &key,
         TYPE_RESPONSE,
         serde_json::json!({"qid": "x", "results": []}),