feat: execute full-repo remaining parity closure plan

tests/NATS.Server.Tests/Monitoring/ConnzParityFieldTests.cs

@@ -0,0 +1,21 @@
+using System.Text.Json;
+
+namespace NATS.Server.Tests;
+
+public class ConnzParityFieldTests
+{
+    [Fact]
+    public async Task Connz_includes_identity_tls_and_proxy_parity_fields()
+    {
+        await using var fx = await MonitoringParityFixture.StartAsync();
+        await fx.ConnectClientAsync("u", "orders.created");
+
+        var connz = fx.GetConnz("?subs=detail");
+        connz.Conns.ShouldNotBeEmpty();
+
+        var json = JsonSerializer.Serialize(connz);
+        json.ShouldContain("tls_peer_cert_subject");
+        json.ShouldContain("jwt_issuer_key");
+        json.ShouldContain("proxy");
+    }
+}