Function sswt_extract_ridge 

pub fn sswt_extract_ridge(
    sst: &SSWTResult,
    config: &GreedyRidgeConfig,
) -> Result<Vec<(usize, usize)>>

Greedy max-energy ridge extractor over time.

Returns Vec<(freq_bin_idx, time_idx)> of length equal to the signal length. The walk seeds at the global SST-plane argmax, then walks outward forward and backward from there, at each step picking the argmax |T| inside ±band_width of the previously chosen bin. This is the seeding strategy used by ssqueezepy’s extract_ridges; it is more robust to CWT edge artifacts than seeding at t = 0, where the argmax may be biased away from the true dominant ridge by FFT-zero-pad spillover. When every bin in a local search window falls below min_magnitude, the ridge holds its previous bin (gap-tolerant). Returns WaveletError::TransformError if every cell in the entire SST plane is below min_magnitude.