Align Windows guard ctx param and doc with X11 guard

internal/enforce/windows.go

@@ -15,7 +15,8 @@ type windowsGuard struct{}
 
 // MinimizeActive minimizes the current foreground window. It is best-effort:
 // with nothing focused it does nothing and returns nil. Stateless and per-call,
-// mirroring the short-lived X11 connection model.
-func (windowsGuard) MinimizeActive(context.Context) error {
+// with no connection or shared state to manage. ShowWindow does not report a
+// minimize failure, so this always returns nil today.
+func (windowsGuard) MinimizeActive(_ context.Context) error {
 	return winapi.MinimizeForeground()
 }