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* Curves: pencil mode, Smooth and Edit points (#3088) The Curves editor (Image > Adjustments dialog and the adjustment layer's Properties panel) gains Photoshop's "Edit points to modify the curve" and "Draw to modify the curve" buttons plus Smooth, with tooltips. A drawn curve is a 256-level map per channel, evaluated piecewise-linearly. - doc: Adjustment::Curves gains `pencil` (serde default), with curve_map / curve_map_outputs helpers. - compose: curve_map_lut / curve_lut_mode for drawn curves. - engine: curves params take `pencil` and `smooth`; channels accept 256-level maps; switching modes draws the spline into maps or fits up to 16 points to the drawing. Eyedroppers fit points first. - io: the PSD `curv` map flag (first byte, psd-tools `is_map`) was read as padding, so pencil curves from Photoshop were misparsed; they are now read and written as 256-byte maps, and smart-filter Curves use `Mpng`. - scorecard UI-217-15 note updated. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * Merge upstream/main: Curves in new compose/gpu HDR tests gets the pencil field (#3088) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Brandon Thomas <echelon@gmail.com>