Function steady_steps 

pub fn steady_steps(
    n: EngineNumerics,
    batch: usize,
    position: usize,
) -> Vec<Step>

The steps a steady decode of batch sequences a row each at position cycles through: one, or under a lazy flush one for every phase of the flush window, sequence i of phase p having logged (i + p) mod tokens tokens past the window a trailing flush is replaying — so their mean is a mean step.