work on navigation

src/Poe2Trade.Navigation/NavigationExecutor.cs

@@ -147,6 +147,22 @@ public class NavigationExecutor : IDisposable
     public byte[] GetMapSnapshot() => _worldMap.GetMapSnapshot();
     public byte[] GetViewportSnapshot(int viewSize = 400) => _worldMap.GetViewportSnapshot(_tracker.Position, viewSize);
 
+    /// <summary>
+    /// Capture one frame, track position, stitch into world map.
+    /// Returns viewport PNG bytes, or null on failure.
+    /// </summary>
+    public byte[]? ProcessFrame()
+    {
+        using var frame = _capture.CaptureFrame();
+        if (frame == null) return null;
+
+        var pos = _tracker.UpdatePosition(frame.GrayMat);
+        _worldMap.StitchFrame(frame.ClassifiedMat, pos);
+        return _worldMap.GetViewportSnapshot(pos);
+    }
+
+    public void SaveDebugCapture() => _capture.SaveDebugCapture();
+
     public void Dispose()
     {
         _capture.Dispose();