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- Median hue instead of mean (robust to background contamination) - Otsu threshold instead of fixed 180 (adapts to colored backgrounds) - Background sampling from border pixels with hue-distance filter - Higher sat_threshold (70) + min_sat_ratio (25%) to reduce false positives - Classify using saturated pixels only for cleaner hue signal Fixes: borrow/lend misdetected as orange (actually red, median_H=5) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>