Function robust_outlier_keep 

pub fn robust_outlier_keep(
    values: &[f32],
    n_mads: f32,
    tail: Tail,
    log1p: bool,
    consider: Option<&[bool]>,
) -> Vec<bool>

Robust outlier keep-mask: keep[i] = false when values[i] falls outside median ± n_mads · MAD · 1.4826 on the requested tail. Count-like metrics should pass log1p = true so the band is symmetric on the multiplicative scale. Consolidates the median+MAD idiom used in cnv::hmm. consider (when Some) restricts the median/MAD band to the cells it marks true — so e.g. near-empty cells don’t contaminate the robust center — while the keep decision is still returned for every cell.