Issue #10: implement worker process launcher

src/MxGateway.Server/Workers/SystemWorkerProcessFactory.cs

@@ -0,0 +1,22 @@
+using System.Diagnostics;
+
+namespace MxGateway.Server.Workers;
+
+public sealed class SystemWorkerProcessFactory : IWorkerProcessFactory
+{
+    public IWorkerProcess Start(ProcessStartInfo startInfo)
+    {
+        Process process = new()
+        {
+            StartInfo = startInfo,
+        };
+
+        if (!process.Start())
+        {
+            process.Dispose();
+            throw new InvalidOperationException("Worker process failed to start.");
+        }
+
+        return new SystemWorkerProcess(process);
+    }
+}