feat: persist sgclaw browser conversations

tests/task_protocol_test.rs

@@ -8,13 +8,20 @@ type HmacSha256 = Hmac<Sha256>;
 
 #[test]
 fn browser_submit_task_round_trip_uses_task_wire_format() {
-    let raw = r#"{"type":"submit_task","instruction":"打开百度并搜索今日汇率"}"#;
+    let raw = r#"{"type":"submit_task","instruction":"打开百度并搜索今日汇率","conversation_id":"conversation-1","messages":[{"role":"assistant","content":"上一轮完成"}],"page_url":"https://www.baidu.com/","page_title":"百度一下"}"#;
     let message: BrowserMessage = serde_json::from_str(raw).unwrap();
 
     assert_eq!(
         message,
         BrowserMessage::SubmitTask {
             instruction: "打开百度并搜索今日汇率".to_string(),
+            conversation_id: "conversation-1".to_string(),
+            messages: vec![sgclaw::pipe::ConversationMessage {
+                role: "assistant".to_string(),
+                content: "上一轮完成".to_string(),
+            }],
+            page_url: "https://www.baidu.com/".to_string(),
+            page_title: "百度一下".to_string(),
         }
     );
     assert_eq!(serde_json::to_string(&message).unwrap(), raw);