fix: use pub_key() instead of peer() in tracing for acceptors

The acceptor's PeerAddr is intentionally Unknown (NAT scenario) since
acceptors don't know their external address until the first recipient
fills it in from the packet source. Changed tracing statements to use
pub_key() instead of peer() to avoid panics on unknown addresses.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: sanity

crates/core/src/operations/connect.rs

@@ -320,8 +320,8 @@ impl RelayState {
             // Use the joiner with updated observed address for response routing
             actions.response_target = Some(self.request.joiner.clone());
             tracing::info!(
-                acceptor_peer = %acceptor.peer(),
-                joiner_peer = %self.request.joiner.peer(),
+                acceptor_pub_key = %acceptor.pub_key(),
+                joiner_pub_key = %self.request.joiner.pub_key(),
                 acceptor_loc = ?acceptor.location,
                 joiner_loc = ?self.request.joiner.location,
                 ring_distance = ?dist,
@@ -690,7 +690,7 @@ impl ConnectOp {
         match self.state.as_mut() {
             Some(ConnectState::WaitingForResponses(state)) => {
                 tracing::info!(
-                    acceptor = %response.acceptor.peer(),
+                    acceptor_pub_key = %response.acceptor.pub_key(),
                     acceptor_loc = ?response.acceptor.location,
                     "connect: joiner received ConnectResponse"
                 );
@@ -970,14 +970,14 @@ impl Operation for ConnectOp {
                                 let mut updated_payload = payload.clone();
                                 updated_payload.acceptor.peer_addr = PeerAddr::Known(acceptor_addr);
                                 tracing::debug!(
-                                    acceptor = %updated_payload.acceptor.peer(),
+                                    acceptor_pub_key = %updated_payload.acceptor.pub_key(),
                                     acceptor_addr = %acceptor_addr,
                                     "connect: filled acceptor address from source_addr"
                                 );
                                 updated_payload
                             } else {
                                 tracing::warn!(
-                                    acceptor = %payload.acceptor.peer(),
+                                    acceptor_pub_key = %payload.acceptor.pub_key(),
                                     "connect: response received without source_addr, cannot fill acceptor address"
                                 );
                                 payload.clone()
@@ -988,7 +988,7 @@ impl Operation for ConnectOp {
 
                         tracing::debug!(
                             upstream_addr = %upstream_addr,
-                            acceptor = %forward_payload.acceptor.peer(),
+                            acceptor_pub_key = %forward_payload.acceptor.pub_key(),
                             "connect: forwarding response towards joiner"
                         );
                         // Forward response toward the joiner via upstream