Fix smoke gaps: recorder target + VK translation, player enum + null guard (#11)

src/Recordingtest.Recorder/Scenario.cs

@@ -31,6 +31,8 @@ public sealed class ScenarioStep
     public double[]? EndOffset { get; set; }
     /// <summary>For drag steps: end raw coordinate [x, y].</summary>
     public int[]? EndRawCoord { get; set; }
+    /// <summary>Raw Win32 virtual-key code for diagnostics (issue #11).</summary>
+    public uint? RawVk { get; set; }
 }
 
 public sealed class ScenarioTarget