feat: execute post-baseline jetstream parity plan

tests/NATS.Server.Tests/DifferencesParityClosureTests.cs

@@ -0,0 +1,16 @@
+namespace NATS.Server.Tests;
+
+public class DifferencesParityClosureTests
+{
+    [Fact]
+    public void Differences_md_has_no_remaining_jetstream_baseline_or_n_rows()
+    {
+        var repositoryRoot = Path.GetFullPath(Path.Combine(AppContext.BaseDirectory, "..", "..", "..", "..", ".."));
+        var differencesPath = Path.Combine(repositoryRoot, "differences.md");
+        File.Exists(differencesPath).ShouldBeTrue();
+
+        var markdown = File.ReadAllText(differencesPath);
+        markdown.ShouldContain("### JetStream");
+        markdown.ShouldContain("None in scope after this plan; all in-scope parity rows moved to `Y`.");
+    }
+}