fix(qa): 探针 evaluate 取值层级修正

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

docs/agent-specs/2026-06-09-agent-loop-v1/orchestrator/probe_bridge_channel.py

@@ -154,7 +154,9 @@ def main() -> int:
                 "expression": "location.href + ' || ' + document.body.innerText.replace(/\\n+/g,' | ').slice(0,200)",
                 "returnByValue": True})
             print("\n==== 页面终态 ====")
-            print(str(r.get("result", {}).get("result", {}).get("value", ""))[:300])
+            # call() 返回 CDP 应答的 result 字段：Runtime.evaluate 的值在 result.result.value
+            val = r.get("result", {}).get("value", "") if "result" in r else r
+            print(str(val)[:300])
         except Exception as e:  # noqa: BLE001 - 取证收尾，异常只记录
             print(f"页面终态读取失败：{e}")
         return 0