test(deploy): verify all v2 instructor viewers after image update

reports/instructors-v2-test-20260915/README.md

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+# v2 数字人镜像发布后验证
+
+测试环境 `http://1.14.103.234:7180`，2026-09-15。
+
+镜像 `digital-human-service:lecture-v2-20260915`；运行 ID `6d66dd620303ea162047d7a9713b30f0f36575750f1a9a03c4f44aaf58f7659d`。
+
+三个稳定形象编号末位 5/6/7 分别对应教员1/2/3。所有 Viewer 成功就绪，8.256 秒语音驱动收到 speaking-start / speaking-end，嘴部驱动分别有 221/206/227 个有效帧，无浏览器或数字人运行错误。详见 `stable-viewer-validation.json` 及三组静态/说话截图。
+
+服务端通过 HTTP 读取三个形象的 manifest、源视频、blend 数据及缩略图，SHA-256 均与提交 `ec0dbd4` 的资源一致。原 `/home/digital-human-service/data` 挂载保留，容器 healthy。
+
+复现：设置 `BASE_URL=http://1.14.103.234:7180`、`REPORT_DIR=reports/instructors-v2-test-20260915`，执行 `node tools/verify_instructors_v2.mjs --stable`。

reports/instructors-v2-test-20260915/stable-viewer-validation.json

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+[
+  {
+    "number": 1,
+    "avatarId": "a1000000000000000000000000000005",
+    "driver": {
+      "frames": 221,
+      "active": 221,
+      "maxBlend": 53.525753021240234
+    },
+    "events": [
+      {
+        "type": "digital-human.ready",
+        "avatarId": "a1000000000000000000000000000005"
+      },
+      {
+        "type": "digital-human.speaking-start",
+        "avatarId": "a1000000000000000000000000000005",
+        "requestId": "v2-validation",
+        "duration": 8.256
+      },
+      {
+        "type": "digital-human.command-accepted",
+        "avatarId": "a1000000000000000000000000000005",
+        "requestId": "v2-validation",
+        "command": "digital-human.play-audio"
+      },
+      {
+        "type": "digital-human.speaking-end",
+        "avatarId": "a1000000000000000000000000000005",
+        "requestId": "v2-validation",
+        "reason": "ended"
+      }
+    ],
+    "errors": []
+  },
+  {
+    "number": 2,
+    "avatarId": "a1000000000000000000000000000006",
+    "driver": {
+      "frames": 206,
+      "active": 206,
+      "maxBlend": 53.52568435668945
+    },
+    "events": [
+      {
+        "type": "digital-human.ready",
+        "avatarId": "a1000000000000000000000000000006"
+      },
+      {
+        "type": "digital-human.speaking-start",
+        "avatarId": "a1000000000000000000000000000006",
+        "requestId": "v2-validation",
+        "duration": 8.256
+      },
+      {
+        "type": "digital-human.command-accepted",
+        "avatarId": "a1000000000000000000000000000006",
+        "requestId": "v2-validation",
+        "command": "digital-human.play-audio"
+      },
+      {
+        "type": "digital-human.speaking-end",
+        "avatarId": "a1000000000000000000000000000006",
+        "requestId": "v2-validation",
+        "reason": "ended"
+      }
+    ],
+    "errors": []
+  },
+  {
+    "number": 3,
+    "avatarId": "a1000000000000000000000000000007",
+    "driver": {
+      "frames": 227,
+      "active": 227,
+      "maxBlend": 53.52568435668945
+    },
+    "events": [
+      {
+        "type": "digital-human.ready",
+        "avatarId": "a1000000000000000000000000000007"
+      },
+      {
+        "type": "digital-human.speaking-start",
+        "avatarId": "a1000000000000000000000000000007",
+        "requestId": "v2-validation",
+        "duration": 8.256
+      },
+      {
+        "type": "digital-human.command-accepted",
+        "avatarId": "a1000000000000000000000000000007",
+        "requestId": "v2-validation",
+        "command": "digital-human.play-audio"
+      },
+      {
+        "type": "digital-human.speaking-end",
+        "avatarId": "a1000000000000000000000000000007",
+        "requestId": "v2-validation",
+        "reason": "ended"
+      }
+    ],
+    "errors": []
+  }
+]