compat: probe zhihu extractor before renavigate

src/compat/workflow_executor.rs

@@ -158,7 +158,9 @@ fn collect_hotlist_items<T: Transport + 'static>(
     top_n: usize,
     task_context: &CompatTaskContext,
 ) -> Result<Vec<HotlistItem>, PipeError> {
-    ensure_hotlist_page_ready(transport, browser_tool, task_context)?;
+    if let Some(items) = ensure_hotlist_page_ready(transport, browser_tool, top_n, task_context)? {
+        return Ok(items);
+    }
     transport.send(&AgentMessage::LogEntry {
         level: "info".to_string(),
         message: "call zhihu-hotlist.extract_hotlist".to_string(),
@@ -186,8 +188,9 @@ fn collect_hotlist_items<T: Transport + 'static>(
 fn ensure_hotlist_page_ready<T: Transport + 'static>(
     transport: &T,
     browser_tool: &BrowserPipeTool<T>,
+    top_n: usize,
     task_context: &CompatTaskContext,
-) -> Result<(), PipeError> {
+) -> Result<Option<Vec<HotlistItem>>, PipeError> {
     let starts_on_hotlist = task_context
         .page_url
         .as_deref()
@@ -198,14 +201,22 @@ fn ensure_hotlist_page_ready<T: Transport + 'static>(
             .is_some_and(|title| title.contains("热榜"));
 
     if starts_on_hotlist && poll_for_hotlist_readiness(browser_tool)? {
-        return Ok(());
+        return Ok(None);
+    }
+    if starts_on_hotlist {
+        if let Some(items) = probe_hotlist_extractor(transport, browser_tool, top_n)? {
+            return Ok(Some(items));
+        }
     }
 
     let mut last_error = None;
     for attempt in 0..2 {
         navigate_hotlist_page(transport, browser_tool)?;
         if poll_for_hotlist_readiness(browser_tool)? {
-            return Ok(());
+            return Ok(None);
+        }
+        if let Some(items) = probe_hotlist_extractor(transport, browser_tool, top_n)? {
+            return Ok(Some(items));
         }
         last_error = Some(PipeError::Protocol(format!(
             "知乎热榜页面已打开，但在短轮询窗口内仍未出现可读热榜内容（attempt={}）",
@@ -216,6 +227,31 @@ fn ensure_hotlist_page_ready<T: Transport + 'static>(
     Err(last_error.unwrap_or_else(|| PipeError::Protocol("知乎热榜页面未就绪".to_string())))
 }
 
+fn probe_hotlist_extractor<T: Transport + 'static>(
+    transport: &T,
+    browser_tool: &BrowserPipeTool<T>,
+    top_n: usize,
+) -> Result<Option<Vec<HotlistItem>>, PipeError> {
+    transport.send(&AgentMessage::LogEntry {
+        level: "info".to_string(),
+        message: "call zhihu-hotlist.extract_hotlist".to_string(),
+    })?;
+    let response = browser_tool.invoke(
+        Action::Eval,
+        json!({ "script": load_hotlist_extractor_script(top_n)? }),
+        ZHIHU_DOMAIN,
+    )?;
+    if !response.success {
+        return Ok(None);
+    }
+
+    match parse_hotlist_items_payload(response.data.get("text").unwrap_or(&response.data)) {
+        Ok(items) if !items.is_empty() => Ok(Some(items)),
+        Ok(_) => Ok(None),
+        Err(_) => Ok(None),
+    }
+}
+
 fn navigate_hotlist_page<T: Transport + 'static>(
     transport: &T,
     browser_tool: &BrowserPipeTool<T>,
@@ -826,10 +862,14 @@ mod tests {
             success_browser_response(9, json!({ "text": "" })),
             success_browser_response(10, json!({ "text": "" })),
             success_browser_response(11, json!({ "text": "" })),
-            success_browser_response(12, json!({ "navigated": true })),
+            success_browser_response(12, json!({ "text": { "rows": [] } })),
-            success_browser_response(13, json!({ "text": "知乎热榜\n1 问题一 344万热度" })),
+            success_browser_response(13, json!({ "navigated": true })),
             success_browser_response(
                 14,
+                json!({ "text": "知乎热榜\n1 问题一 344万热度" }),
+            ),
+            success_browser_response(
+                15,
                 json!({
                     "text": {
                         "source": "https://www.zhihu.com/hot",
@@ -843,7 +883,7 @@ mod tests {
         let browser_tool = BrowserPipeTool::new(
             transport.clone(),
             zhihu_test_policy(),
-            vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14],
+            vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15],
         )
         .with_response_timeout(Duration::from_secs(1));
         let task_context = CompatTaskContext {
@@ -868,6 +908,72 @@ mod tests {
             .count();
         assert_eq!(navigate_count, 2);
     }
+
+    #[test]
+    fn collect_hotlist_items_uses_extractor_probe_before_second_navigation() {
+        let transport = Arc::new(MockWorkflowTransport::new(vec![
+            success_browser_response(1, json!({ "navigated": true })),
+            success_browser_response(2, json!({ "text": "知乎热榜" })),
+            success_browser_response(3, json!({ "text": "知乎热榜" })),
+            success_browser_response(4, json!({ "text": "知乎热榜" })),
+            success_browser_response(5, json!({ "text": "知乎热榜" })),
+            success_browser_response(6, json!({ "text": "知乎热榜" })),
+            success_browser_response(7, json!({ "text": "知乎热榜" })),
+            success_browser_response(8, json!({ "text": "知乎热榜" })),
+            success_browser_response(9, json!({ "text": "知乎热榜" })),
+            success_browser_response(10, json!({ "text": "知乎热榜" })),
+            success_browser_response(11, json!({ "text": "知乎热榜" })),
+            success_browser_response(
+                12,
+                json!({
+                    "text": {
+                        "source": "https://www.zhihu.com/hot",
+                        "sheet_name": "知乎热榜",
+                        "columns": ["rank", "title", "heat"],
+                        "rows": [[1, "问题一", "344万"]]
+                    }
+                }),
+            ),
+            success_browser_response(
+                13,
+                json!({
+                    "text": {
+                        "source": "https://www.zhihu.com/hot",
+                        "sheet_name": "知乎热榜",
+                        "columns": ["rank", "title", "heat"],
+                        "rows": [[1, "问题一", "344万"]]
+                    }
+                }),
+            ),
+        ]));
+        let browser_tool = BrowserPipeTool::new(
+            transport.clone(),
+            zhihu_test_policy(),
+            vec![1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13],
+        )
+        .with_response_timeout(Duration::from_secs(1));
+        let task_context = CompatTaskContext {
+            page_url: Some("https://www.zhihu.com/".to_string()),
+            page_title: Some("知乎".to_string()),
+            ..CompatTaskContext::default()
+        };
+
+        let items = collect_hotlist_items(transport.as_ref(), &browser_tool, 10, &task_context)
+            .expect("hotlist collection should succeed via extractor probe");
+
+        assert_eq!(items.len(), 1);
+        let sent = transport.sent_messages();
+        let navigate_count = sent
+            .iter()
+            .filter(|message| {
+                matches!(
+                    message,
+                    AgentMessage::Command { action, .. } if action == &Action::Navigate
+                )
+            })
+            .count();
+        assert_eq!(navigate_count, 1);
+    }
 }
 
 fn load_browser_skill_script(