feat: add config-owned direct submit runtime

Keep browser-attached workflows on the configured direct-skill path and align the Zhihu export/browser regression contracts with the current ws merge state.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/browser/callback_host.rs

@@ -667,7 +667,7 @@ fn normalize_callback_result(
             }))
         }
         "eval" if result.callback == EVAL_CALLBACK_NAME => {
-            let value = result.payload.get("value").and_then(Value::as_str)?;
+            let value = result.payload.get("value")?.clone();
             Some(BrowserCallbackResponse::Success(BrowserCallbackSuccess {
                 success: true,
                 data: json!({ "text": value }),
@@ -1403,4 +1403,36 @@ mod tests {
             other => panic!("expected Success, got {other:?}"),
         }
     }
+
+    #[test]
+    fn normalize_callback_result_path_a_eval_accepts_structured_value_payload() {
+        let request = make_request("eval");
+        let result = CallbackResult {
+            callback: "sgclawOnEval".to_string(),
+            request_url: "http://127.0.0.1:17888/sgclaw/browser-helper.html".to_string(),
+            target_url: Some("https://www.zhihu.com/hot".to_string()),
+            action: Some("sgBrowserExcuteJsCodeByDomain".to_string()),
+            payload: json!({
+                "value": {
+                    "source": "https://www.zhihu.com/hot",
+                    "rows": [[1, "问题一", "344万"]]
+                }
+            }),
+        };
+
+        let response = normalize_callback_result(&request, result, Duration::from_millis(10));
+        assert!(response.is_some(), "Path A eval should accept structured values");
+        match response.unwrap() {
+            super::super::callback_backend::BrowserCallbackResponse::Success(s) => {
+                assert_eq!(
+                    s.data.get("text").unwrap(),
+                    &json!({
+                        "source": "https://www.zhihu.com/hot",
+                        "rows": [[1, "问题一", "344万"]]
+                    })
+                );
+            }
+            other => panic!("expected Success, got {other:?}"),
+        }
+    }
 }