v2v dynamic system

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// =====================================================================
// v3 Bias Color Mapper (smooth hyperbolic scaling via atan)
// =====================================================================
color GetBiasColorV3(string bias, double val, double signedPercent, bool isSynthetic)
{
   // Base colors
   color cStrongUp   = clrLimeGreen;
   color cUp         = clrMediumSeaGreen;
   color cNeutral    = SafeColor(val >= 4.5 ? clrLightGray : RGBc(180,180,180));
   color cDown       = clrDarkOrange;
   color cStrongDown = clrCrimson;

   // Synthetic slightly more "intense"
   double synBoost = (isSynthetic ? 1.20 : 1.00);
   // Convert signedPercent (-1..+1) into soft intensity (0..1)
   double raw = MathAbs(signedPercent);
   double inten = (2.0 / 3.1415926535) * MathArctan(2.5 * raw * synBoost);
   if (inten < 0.0) inten = 0.0;
   if (inten > 1.0) inten = 1.0;
   if (bias == "strong_strengthening") return MixColor(cNeutral, cStrongUp,   inten);
   if (bias == "strengthening")        return MixColor(cNeutral, cUp,         inten);
   if (bias == "weakening")            return MixColor(cNeutral, cDown,       inten);
   if (bias == "strong_weakening")     return MixColor(cNeutral, cStrongDown, inten);

   return(cNeutral);
}