Add soft shoulder edge definitions to build runtime scene tests

tests/domain/build-runtime-scene.test.ts

@@ -721,8 +721,26 @@ describe("buildRuntimeSceneFromDocument", () => {
           heightOffset: 0.03,
           terrainConform: true,
           materialId: null,
+          material: null,
+          edges: {
+            left: {
+              enabled: false,
+              kind: "softShoulder",
+              width: 0.35,
+              height: 0.12,
+              materialId: null,
               material: null
             },
+            right: {
+              enabled: false,
+              kind: "softShoulder",
+              width: 0.35,
+              height: 0.12,
+              materialId: null,
+              material: null
+            }
+          }
+        },
         points: [
           {
             pointId: "path-point-a",