feat: wait for terrain before drawing clouds

config.js

@@ -335,6 +335,10 @@ window.CONFIG = {
             start: 0.35,          // world units: clouds fade out very close to camera
             end: 2.5              // full density from this distance onward
         },
+        // Delay the volumetric cloud pass until the DEM/terrain mesh is
+        // ready. This avoids clouds appearing over an unfinished ground model.
+        waitForTerrain: true,     // false = draw clouds immediately
+        // waitForTerrain: false
         // Coverage per weather level, 0 = clear, 1 = overcast. Only the
         // levels listed here override the built-in defaults
         // (sunny 0.20, cloudy 0.70, stormy 0.80, night 0.45). Live weather