Panel readout shows the wire values while the dot stays physical

With Invert Y checked the readout claimed "Y 80" while the AnalogReply
carried -80. The flip is factored into VRioDevice.WireY, shared by the
reply builder and the new GetWireAxis accessor; the canvas readout uses
a WireAxisProvider fed from it, and toggling the checkbox repaints so
the sign flips in place. Dot and gauges keep tracking the stick.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/VRio.App/MainForm.cs

@@ -148,6 +148,7 @@ internal sealed class MainForm : Form
         // Canvas ↔ device wiring.
         _canvas.LampProvider = _device.GetLamp;
         _canvas.AxisProvider = _device.GetAxis;
+        _canvas.WireAxisProvider = _device.GetWireAxis;
         _canvas.AddressPressed += _device.PressAddress;
         _canvas.AddressReleased += _device.ReleaseAddress;
         _canvas.AxisMoved += (axis, value) => _device.SetAxis(axis, value);
@@ -192,7 +193,11 @@ internal sealed class MainForm : Form
             if (!_kbInput.Checked)
                 _router.ReleaseAllKeys();
         };
-        _invertY.CheckedChanged += (_, _) => _device.InvertJoystickY = _invertY.Checked;
+        _invertY.CheckedChanged += (_, _) =>
+        {
+            _device.InvertJoystickY = _invertY.Checked;
+            _canvas.Invalidate(); // the wire readout flips even though the axes didn't move
+        };
         _device.InvertJoystickY = _invertY.Checked; // the field initializer raises no event
         _kbLights.CheckedChanged += (_, _) =>
         {