Phase 3: statscore-information — entropy, divergence, mutual information + Python

[armanrasta]

Summary

Information theory measures. Python bindings ship alongside.

Rust (statscore-information)

• Entropy: Shannon, Rényi, Tsallis, differential
• Divergence: KL, JS, Hellinger, total variation
• Mutual information, conditional MI, transfer entropy

Python bindings (statscore.information)

• NumPy array inputs for histogram-based MI
• Tests vs scipy.stats.entropy / sklearn