auto-git:

[change] tests/domain/scene-document-validation.test.ts
 [change] tests/domain/world-settings.test.ts
 [change] tests/serialization/project-document-json.test.ts
 [change] tests/unit/world-shader-sky.test.ts

tests/domain/scene-document-validation.test.ts

@@ -1171,6 +1171,7 @@ describe("validateSceneDocument", () => {
       mode: "shader"
     };
     document.world.shaderSky.dayTopColorHex = "bad-color" as `#${string}`;
+    document.world.shaderSky.horizonHeight = 0.75;
     document.world.shaderSky.celestial.sunDiscSizeDegrees = 0;
     document.world.shaderSky.clouds.coverage = 2;
     document.world.timeOfDay.dawn.background = {
@@ -1185,6 +1186,10 @@ describe("validateSceneDocument", () => {
           code: "invalid-world-shader-sky-day-top-color",
           path: "world.shaderSky.dayTopColorHex"
         }),
+        expect.objectContaining({
+          code: "invalid-world-shader-sky-horizon-height",
+          path: "world.shaderSky.horizonHeight"
+        }),
         expect.objectContaining({
           code: "invalid-world-shader-sky-sun-disc-size",
           path: "world.shaderSky.celestial.sunDiscSizeDegrees"

tests/domain/world-settings.test.ts

@@ -168,4 +168,13 @@ describe("world settings helpers", () => {
 
     expect(areWorldSettingsEqual(left, right)).toBe(false);
   });
+
+  it("treats shader sky horizon height as part of authored world equality", () => {
+    const left = createDefaultWorldSettings();
+    const right = cloneWorldSettings(left);
+
+    right.shaderSky.horizonHeight = 0.08;
+
+    expect(areWorldSettingsEqual(left, right)).toBe(false);
+  });
 });