v1.11.0

Added

• Color workspace. An Edit / Color switch in the top bar. Color swaps
  the media bin for live scopes of the program monitor (or of the export
  frame, when one is set) — waveform, RGB parade, vectorscope (75 %
  targets and a skin-tone line) and histogram, two at a time — and opens
  the new Color tab beside the Inspector and Mixer.
• Color grading (props.grade) on video, image, SVG and adjustment
  clips, run on the GPU (WebGL2, with a CPU fallback) before the clip is
  composited, so preview and export match: lift / gamma / gain / offset
  wheels with master sliders, exposure and white balance in linear
  light, a white-balance picker (click something white or grey in the
  monitor), blacks / shadows / midtones / highlights / whites, log-style
  contrast with a pivot, soft rolloff into black and white, and
  saturation. On / off to compare, Reset, and Copy / Paste a grade onto
  every selected clip. The existing filter sliders and presets still apply on
  top.
• Curves in the Color tab: a luma curve (brightness only) and R / G / B
  curves, plus hue vs hue, hue vs saturation, hue vs luma and
  saturation vs luma. Click to add a point, drag to move it, double-click
  to remove it; Pick marks a colour from the monitor on the curve. A hue
  curve with one point is a band around that hue. Stored in props.grade
  (curves, hueHue, hueSat, hueLuma, satLuma) and set by agents with
  setGrade.
• Layers (secondaries) in the Color tab: corrections limited by an HSL
  qualifier (hue / saturation / luma ranges with softness, invert, and a
  Pick that selects a colour from the monitor) and / or a mask (ellipse,
  rectangle or polygon; feather, invert, rotation), dragged on the monitor
  and keyframable. Matte shows what a layer selects. Each layer has its
  own wheels, sliders and curves; up to 8 stack in order. Stored in
  props.grade.layers. Agents edit one layer with the patch op
  setGradeLayer and check it with fablecut_scopes {matte:{clip, layer}}
  (coverage, plus the levels and colour of the selected pixels).
• Agents: the patch op setGrade (merge, reset a key with null,
  replace, several clips at once; validated, honours locks) and the tool
  fablecut_scopes, which renders the graded frame exactly as export
  would and returns luma levels, clipping, mean RGB, saturation and the
  colour cast as numbers.
• The keyboard-shortcuts dialog (?) lists the Color workspace gestures
  (wheels, pickers, curves, masks on the monitor) and the audio volume line.