Function simulate_video_with_progress 

pub fn simulate_video_with_progress(
    path: &Path,
    config: SimulatorConfig,
    scale: Option<(usize, usize)>,
    max_frames: Option<usize>,
    on_events: impl FnMut(EventStream) -> Result<()>,
    on_progress: impl FnMut(SimulateProgress) -> Result<()>,
) -> Result<(usize, usize)>

simulate_video, reporting after every frame.

Split out rather than folded in because a simulation is long enough that a caller needs to see it moving, and there is nothing else in the loop that knows the frame count. on_progress returns a Result so that the same hook can stop the run — a caller polling for Ctrl+C has nowhere else to do it, since a whole simulation is one uninterruptible call otherwise.