fix(payment): block merkle pay-yourself via DHT closeness check

src/devnet.rs

@@ -635,6 +635,11 @@ impl Devnet {
         *node.state.write().await = NodeState::Running;
 
         if let (Some(ref p2p), Some(ref protocol)) = (&node.p2p_node, &node.ant_protocol) {
+            // Wire the P2PNode into the payment verifier for merkle-closeness checks.
+            protocol
+                .payment_verifier_arc()
+                .attach_p2p_node(Arc::clone(p2p));
+
             let mut events = p2p.subscribe_events();
             let p2p_clone = Arc::clone(p2p);
             let protocol_clone = Arc::clone(protocol);

src/node.rs

@@ -130,6 +130,15 @@ impl NodeBuilder {
 
         let p2p_arc = Arc::new(p2p_node);
 
+        // Wire the P2PNode handle into the payment verifier so merkle-payment
+        // checks can query the live DHT for peers actually closest to a pool
+        // midpoint (pay-yourself defence).
+        if let Some(ref protocol) = ant_protocol {
+            protocol
+                .payment_verifier_arc()
+                .attach_p2p_node(Arc::clone(&p2p_arc));
+        }
+
         // Initialize replication engine (if storage is enabled)
         let replication_engine =
             if let (Some(ref protocol), Some(fresh_rx)) = (&ant_protocol, fresh_write_rx) {