test(ambilight): [PKG-AMBILIGHT-01] freeze actual release and invocation contracts

refactor/tasks.json

@@ -1458,11 +1458,16 @@
       "dependsOn": [
         "BASE-05"
       ],
-      "status": "todo",
+      "status": "done",
       "risk": "M",
       "deliverable": "blur/opacity/frequency/duration、start/stop 与挂载样式",
       "acceptance": "源码/声明/README/demo/发布包差异已登记；公开形状和版本范围冻结",
-      "evidence": []
+      "evidence": [
+        "changes/2026-09-12-PKG-AMBILIGHT-01-contract.md",
+        "baselines/ambilight-contract.md",
+        "baselines/ambilight-release.json",
+        "baselines/ambilight-contract-validation.json"
+      ]
     },
     {
       "id": "PKG-AMBILIGHT-02",