test: add go jetstream parity runner

docs/plans/jetstream-go-suite-map.md

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+# JetStream Go Suite Map
+
+This map tracks the Go suite families included by `scripts/run-go-jetstream-parity.sh`.
+
+- `TestJetStream`: core stream/consumer API and data-path behavior.
+- `TestJetStreamCluster`: clustered JetStream semantics, placement, and failover.
+- `TestLongCluster`: long-running clustered behaviors and stabilization scenarios.
+- `TestRaft`: RAFT election, replication, and snapshot behavior used by JetStream.
+
+Runner command:
+
+```bash
+go test -v -run 'TestJetStream|TestJetStreamCluster|TestLongCluster|TestRaft' ./server -count=1 -timeout=180m
+```

scripts/run-go-jetstream-parity.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+repo_root="$(cd "${script_dir}/.." && pwd)"
+
+go_root="${repo_root}/golang/nats-server"
+if [[ ! -d "${go_root}" && -d "/Users/dohertj2/Desktop/natsdotnet/golang/nats-server" ]]; then
+  go_root="/Users/dohertj2/Desktop/natsdotnet/golang/nats-server"
+fi
+
+if [[ ! -d "${go_root}" ]]; then
+  echo "Unable to locate golang/nats-server checkout." >&2
+  exit 1
+fi
+
+cd "${go_root}"
+go test -v -run 'TestJetStream|TestJetStreamCluster|TestLongCluster|TestRaft' ./server -count=1 -timeout=180m

tests/NATS.Server.Tests/GoParityRunnerTests.cs

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+namespace NATS.Server.Tests;
+
+public class GoParityRunnerTests
+{
+    [Fact]
+    public void Go_parity_runner_builds_expected_suite_filter()
+    {
+        var cmd = GoParityRunner.BuildCommand();
+        cmd.ShouldContain("go test");
+        cmd.ShouldContain("TestJetStream");
+        cmd.ShouldContain("TestRaft");
+    }
+}
+
+internal static class GoParityRunner
+{
+    public static string BuildCommand()
+    {
+        return "go test -v -run 'TestJetStream|TestJetStreamCluster|TestLongCluster|TestRaft' ./server -count=1 -timeout=180m";
+    }
+}