Restore wine access after program loses and regains focus.

README.md

@@ -89,6 +89,13 @@ The helper is started automatically when Cthulhu-Go detects an active Wine
 loader for the same user and prefix. It requires the Go service to be running;
 it exits if `org.stormux.Cthulhu1.Service` is unavailable.
 
+When a game closes inside a Wine virtual desktop, the desktop can regain X11
+focus while Wine has no foreground application. The helper restores native
+focus when exactly one visible, enabled application remains. Both X11 keyboard
+focus and the window manager's active window must identify that same virtual
+desktop. Existing application focus, Linux windows, minimized/disabled windows,
+and ambiguous choices between multiple applications are left alone.
+
 ## Protocol and behavior
 
 `nvdaController.idl` contains the compatible local RPC interfaces. The helper