Function diagnose_array 

pub fn diagnose_array<S, D, F>(array: &ArrayBase<S, D>, name: &str) -> String
where
    S: Data<Elem = F>,
    D: Dimension,
    F: Float + Display,

Comprehensive array health check, returning a human-readable diagnostic string.

Reports shape, stats, and any issues found (NaN, Inf, negative values, etc.).