Module analysis 

Capacity estimation and chi-square detectability analysis, plus spectral-domain detectability scoring.

Pure domain logic — no I/O, no file system, no async runtime.

Functions

chi_square_score

Chi-square statistic on byte value distribution.

classify_risk

Classify detectability risk from a chi-square score in dB.

estimate_capacity

Estimate embedding capacity for a cover/technique pair.

pair_delta_chi_square_score

Compute a pair-delta chi-square score on data.

recommended_payload

Compute recommended max payload bytes for a given capacity and risk.

spectral_detectability_score

Run a spectral-domain detectability analysis comparing original to stego.