build: bootstrap solution and quality gates (#3)

Closes #3

src/FinalFactory.Rendezvous.TestClient/Program.cs

@@ -0,0 +1,16 @@
+namespace FinalFactory.Rendezvous.TestClient;
+
+/// <summary>
+/// Bootstrap entry point for the public-SDK-only diagnostic client.
+/// </summary>
+public static class Program
+{
+    /// <summary>
+    /// Runs the bootstrap diagnostic.
+    /// </summary>
+    public static int Main()
+    {
+        Console.WriteLine("Rendezvous TestClient bootstrap is ready.");
+        return 0;
+    }
+}