Wire carries stick-up as negative; Invert Y opts back to physical

The old Invert joystick Y box (checked by default) is now the wire's
native convention: full up = -80 in AnalogReply with the flag off.
Checking the renamed Invert Y sends the physical direction (up = +80).

Control strip cleanup: test-mode buttons and the firmware selector are
gone (the device still reports 4.2), Keyboard/Gamepad/Invert Y share
one line, the help text drops the bindings sentence, and the wire log
gets the reclaimed height.

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

tests/VRio.Core.Tests/VRioDeviceTests.cs

@@ -61,15 +61,15 @@ public class VRioDeviceTests
         Assert.Equal(1000, AnalogCodec.Combine(p[0], p[1]));   // throttle
         Assert.Equal(0, AnalogCodec.Combine(p[2], p[3]));      // left pedal
         Assert.Equal(0, AnalogCodec.Combine(p[4], p[5]));      // right pedal
-        Assert.Equal(3000, AnalogCodec.Combine(p[6], p[7]));   // joystick Y
+        Assert.Equal(-3000, AnalogCodec.Combine(p[6], p[7]));  // joystick Y (up is negative on the wire)
         Assert.Equal(-5000, AnalogCodec.Combine(p[8], p[9]));  // joystick X
         Assert.Equal(1, device.AnalogRequests);
     }
 
     [Fact]
-    public void InvertJoystickY_flips_the_wire_but_not_local_state()
+    public void Joystick_Y_is_negated_on_the_wire_but_not_locally()
     {
-        var device = new VRioDevice { InvertJoystickY = true };
+        var device = new VRioDevice();
         var wire = new Wire(device);
         device.SetAxis(RioAxis.JoystickY, 3000);
 
@@ -88,6 +88,20 @@ public class VRioDeviceTests
         Assert.Equal(AnalogCodec.Max, AnalogCodec.Combine(p[6], p[7]));
     }
 
+    [Fact]
+    public void InvertJoystickY_sends_the_physical_direction_instead()
+    {
+        var device = new VRioDevice { InvertJoystickY = true };
+        var wire = new Wire(device);
+        device.SetAxis(RioAxis.JoystickY, 3000);
+
+        Send(device, PacketBuilder.Build(RioCommand.AnalogRequest));
+
+        byte[] p = Assert.Single(wire.Packets).Payload;
+        Assert.Equal(3000, AnalogCodec.Combine(p[6], p[7]));
+        Assert.Equal(3000, device.GetWireAxis(RioAxis.JoystickY));
+    }
+
     [Fact]
     public void VersionRequest_reports_configured_firmware()
     {