atmosphere: remove volumetric fog pass

config.js

@@ -307,12 +307,7 @@ window.CONFIG = {
         airGain: 0.55,            // Rayleigh airlight strength (blue-biased)
         distanceFog: false,       // legacy aerial perspective is off
         model: {
-            enabled: true,
-            heightKm: 35.0,       // full atmosphere shell around the planet
-            scaleHeightKm: 8.5,   // density falls exponentially with altitude
-            density: 0.12,        // base optical density
-            grayTau: 1.5,         // high optical depth becomes grey fog
-            gain: 2.0             // scattering brightness
+            enabled: false        // volumetric atmosphere/fog removed
         },
         hazeResidual: 0.30,       // surface colour surviving at the full fog distance
         cloudBrightness: 1.0,     // cloud albedo (theme hue, brightness from the model)