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.Core/Device/VRioDevice.cs

@@ -108,6 +108,20 @@ public sealed class VRioDevice
         lock (_gate) return _axes[(int)axis];
     }
 
+    /// <summary>
+    /// Axis value as the next AnalogReply will carry it — same as
+    /// <see cref="GetAxis"/> except for the <see cref="InvertJoystickY"/> flip.
+    /// </summary>
+    public short GetWireAxis(RioAxis axis)
+    {
+        short value = GetAxis(axis);
+        return axis == RioAxis.JoystickY ? WireY(value) : value;
+    }
+
+    private short WireY(short y) => InvertJoystickY
+        ? (short)Math.Min(AnalogCodec.Max, -y) // clamp: -Min (8192) is one past the 14-bit Max
+        : y;
+
     /// <summary>
     /// Move an axis. Values are clamped to the 14-bit signed range the wire
     /// can carry; the new value is returned by the next AnalogReply.
@@ -281,9 +295,7 @@ public sealed class VRioDevice
                     y = _axes[(int)RioAxis.JoystickY];
                     x = _axes[(int)RioAxis.JoystickX];
                 }
-                if (InvertJoystickY) // clamp: -Min (8192) is one past the 14-bit Max
-                    y = (short)Math.Min(AnalogCodec.Max, -y);
-                Send(PacketBuilder.AnalogReply(t, l, r, y, x));
+                Send(PacketBuilder.AnalogReply(t, l, r, WireY(y), x));
                 break;
 
             case RioCommand.ResetRequest: