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Scanner shadow detection (range > 40, darkest < 180) fails on camera book scans where the gutter shadow is subtle (range ~25, darkest ~214). New _detect_gutter_continuity() detects gutters by their unique property: the shadow runs continuously from top to bottom without interruption. Divides the image into horizontal strips and checks what fraction of strips are darker than the page median at each column. A gutter column has >= 75% of strips darker. The transition point where the smoothed dark fraction drops below 50% marks the crop boundary. Integrated as fallback between scanner shadow and binary projection. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>