Julian Pawlowski 325d855997 feat(utils): add coefficient of variation (CV) calculation ... Add calculate_coefficient_of_variation() as central utility function: - CV = (std_dev / mean) * 100 as standardized volatility measure - calculate_volatility_with_cv() returns both level and numeric CV - Volatility sensors now expose CV in attributes for transparency Used as foundation for quality gates, adaptive smoothing, and period statistics. Impact: Volatility sensors show numeric CV percentage alongside categorical level, enabling users to see exact price variation.		2025-12-22 23:21:38 +00:00
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tibber_prices	feat(utils): add coefficient of variation (CV) calculation	2025-12-22 23:21:38 +00:00