message: [terminal] Color: forward similarity threshold parameter to distinct().
diff: @@ -143,9 +143,9 @@ struct RGBColorPair
  return distance(foreground, background) <= threshold;
  }
  - [[nodiscard]] RGBColorPair distinct() const noexcept
  + [[nodiscard]] RGBColorPair distinct(double threshold = 0.1) const noexcept
  {
  - if (isTooSimilar())
  + if (isTooSimilar(threshold))
  return { foreground.inverse(), foreground };
  else
  return *this;
  