feat: soft cloud layer edges

config.js

@@ -335,6 +335,14 @@ window.CONFIG = {
             start: 0.35,          // world units: clouds fade out very close to camera
             end: 2.5              // full density from this distance onward
         },
+        // Soft cloud edges: instead of a hard shell boundary, the deck fades
+        // vertically and near grazing horizon rays. This targets the visible
+        // cloud-deck ring without changing the actual cloud top/bottom.
+        softEdges: true,
+        edgeSoftness: 0.18,       // world units of vertical soft padding
+        horizonSoftness: 8.0,     // path-length fade for grazing cloud rays
+        maxMarchUnits: 120,       // raymarch cap; 30 was the old fixed cap
+        // softEdges: false        // old hard-edged shell behaviour
         // Terrain occlusion for clouds. false draws clouds in front of the
         // terrain mesh even when terrain is closer; true clips cloud rays
         // against the terrain distance buffer.