atmosphere: enable cloud shadows on terrain

config.js

@@ -366,7 +366,7 @@ window.CONFIG = {
         cloudBrightness: 1.0,     // cloud albedo (theme hue, brightness from the model)
         cloudHaze: 0.22,          // share of the ground haze applied to the deck
         // Cloud shadows: the terrain samples the same cloud field as the sky pass.
-        cloudShadows: false,
+        cloudShadows: true,
         cloudShadowDensity: 1.8,  // optical depth through the deck
         cloudShadowFloor: 0.06,   // darkest shade under a thick cloud
         cloudShadowAmbient: 0.65, // share of the skylight a deck also blocks