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Adds rgb_to_hsl / hsl_to_rgb mirroring the existing HSV implementation style, plus Image::adjust_lightness(delta) with clamped hue-preserving lighten/darken. 5 new tests: primary/white reference values, exact 8-bit round trips over 10 samples, gray invariance, +-1 delta saturates to white/black, delta 0 exact copy with alpha preserved. 172/172 tests passing. Closes #74