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* CURVE node * remove curve to sigmas node * feat: add CurveInput ABC with MonotoneCubicCurve implementation (#12986) CurveInput is an abstract base class so future curve representations (bezier, LUT-based, analytical functions) can be added without breaking downstream nodes that type-check against CurveInput. MonotoneCubicCurve is the concrete implementation that: - Mirrors frontend createMonotoneInterpolator (curveUtils.ts) exactly - Pre-computes slopes as numpy arrays at construction time - Provides vectorised interp_array() using numpy for batch evaluation - interp() for single-value evaluation - to_lut() for generating lookup tables CurveEditor node wraps raw widget points in MonotoneCubicCurve. * linear curve * refactor: move CurveEditor to comfy_extras/nodes_curve.py with V3 schema * feat: add HISTOGRAM type and histogram support to CurveEditor * code improve --------- Co-authored-by: Christian Byrne <cbyrne@comfy.org>