refactor(mask): [PKG-MASK-03] isolate model runs and release stale work

refactor/tasks.json

@@ -2563,11 +2563,14 @@
         "CORE-18",
         "PKG-DANMUKU-07"
       ],
-      "status": "todo",
+      "status": "done",
       "risk": "H",
       "deliverable": "模型加载/推理/画布输出分离，阻止重叠推理与过期写入",
       "acceptance": "结构变化和缺陷修复分开记录；原 API/事件/资源生命周期通过",
-      "evidence": []
+      "evidence": [
+        "changes/2026-09-13-PKG-MASK-03-lifecycle.md",
+        "baselines/danmuku-mask-lifecycle-validation.json"
+      ]
     },
     {
       "id": "PKG-MASK-04",