Function bayesian_decode 

pub fn bayesian_decode(
    spike_counts: &[f64],
    tuning_rates: &[f64],
    n_stimuli: usize,
    n_neurons: usize,
    prior: &[f64],
) -> usize

Bayesian MAP decoder (Dayan & Abbott 2001). spike_counts: (n_neurons,). tuning_rates: (n_stimuli × n_neurons, row-major flat). prior: (n_stimuli,) or empty for uniform. Returns MAP stimulus index.