feat: complete final jetstream parity transport and runtime baselines

tests/NATS.Server.Tests/JetStreamConsumerSemanticsTests.cs

@@ -0,0 +1,16 @@
+namespace NATS.Server.Tests;
+
+public class JetStreamConsumerSemanticsTests
+{
+    [Fact]
+    public async Task Consumer_with_filter_subjects_only_receives_matching_messages()
+    {
+        await using var fx = await JetStreamApiFixture.StartWithMultiFilterConsumerAsync();
+        await fx.PublishAndGetAckAsync("orders.created", "1");
+        await fx.PublishAndGetAckAsync("payments.settled", "2");
+
+        var batch = await fx.FetchAsync("ORDERS", "CF", 10);
+        batch.Messages.ShouldNotBeEmpty();
+        batch.Messages.All(m => m.Subject.StartsWith("orders.", StringComparison.Ordinal)).ShouldBeTrue();
+    }
+}