fix(gateway): 修复已完成子智能体任务卡在"子智能体正在执行..."

TaskStarted 补发逻辑改为基于 tool_result 存在性判断（替代 state==Running），
并在补发事件中携带 tool_call_id 以实现前端精确匹配。

- TaskSession 新增 tool_call_id 字段，runtime.spawn 时从 parent_context 注入
- send_topic_history/send_task_messages 收集历史中已有 tool_result 的 tool_call_id
  集合，仅对没有 tool_result 的任务补发 TaskStarted（不论 Running/Completed）
- 补发时传入 task.tool_call_id，前端可精确匹配 task tool_call 卡片，
  避免多并行子智能体场景下 fallback 串扰
- 移除未使用的 TaskSessionState 导入

修复场景：父智能体启动多个并行子智能体，其中一个完成但另一个仍在运行时
重载 topic，已完成的子智能体因 state!=Running 被跳过，导致其 tool_call
卡片永远收不到 TaskStarted，卡在"子智能体正在执行..."无法变为"查看实时进度"。

src/command/handlers/load_task_messages.rs

@@ -188,6 +188,7 @@ fn reconstruct_task_from_db(
         updated_at: now,
         summary: None,
         error: None,
+        tool_call_id: None,
     }))
 }
 

src/gateway/ws.rs

@@ -30,7 +30,6 @@ use crate::gateway::agent_factory::build_system_prompt_provider;
 use crate::protocol::{MediaSummary, WsInbound, WsOutbound, parse_inbound, serialize_outbound};
 use crate::storage::persistent_session_id;
 use crate::tools::task::repository::TaskRepository;
-use crate::tools::task::types::TaskSessionState;
 use axum::extract::State;
 use axum::extract::ws::{Message as WsMessage, WebSocket, WebSocketUpgrade};
 use axum::response::Response;
@@ -790,6 +789,17 @@ async fn send_topic_history(
 
     tracing::info!(topic_id = %topic_id, message_count = messages.len(), "Sending topic history");
 
+    // 收集已有 tool_result 的 tool_call_id 集合，用于判断任务是否已有结果
+    let mut tool_call_ids_with_results: std::collections::HashSet<String> =
+        std::collections::HashSet::new();
+    for msg in &messages {
+        if msg.role == "tool" {
+            if let Some(ref tcid) = msg.tool_call_id {
+                tool_call_ids_with_results.insert(tcid.clone());
+            }
+        }
+    }
+
     // 将消息转换为 WsOutbound 并发送
     for msg in messages {
         for outbound in chat_message_to_ws_outbound(&msg) {
@@ -797,9 +807,9 @@ async fn send_topic_history(
         }
     }
 
-    // 查询该话题下所有运行中的子智能体任务，补发 TaskStarted 事件
+    // 查询该话题下所有子智能体任务，补发 TaskStarted 事件
     // 解决页面刷新后 navigateToTaskId 丢失的问题
-    let running_tasks = match task_repository.list_tasks_for_topic(topic_id).await {
+    let tasks = match task_repository.list_tasks_for_topic(topic_id).await {
         Ok(tasks) => tasks,
         Err(e) => {
             tracing::warn!(error = %e, topic_id = %topic_id, "Failed to list tasks for topic");
@@ -807,8 +817,19 @@ async fn send_topic_history(
         }
     };
 
-    for task in running_tasks {
+    for task in tasks {
-        if task.state == TaskSessionState::Running {
+        // 判断是否需要补发 TaskStarted：
+        // - 如果该任务的 tool_call_id 已有对应的 tool_result，前端会显示结果，不需要补发
+        // - 否则（Running 状态或已完成但结果未进入历史），补发 TaskStarted 以便前端显示"查看实时进度"
+        let has_tool_result = task
+            .tool_call_id
+            .as_ref()
+            .map(|tcid| tool_call_ids_with_results.contains(tcid))
+            .unwrap_or(false);
+        if has_tool_result {
+            continue;
+        }
+
         // 判断是否为孙智能体：parent_session_id 以 "sub:" 开头表示父会话是子智能体
         let parent_task_id = extract_parent_task_id(&task);
 
@@ -816,7 +837,9 @@ async fn send_topic_history(
             task_id = %task.id,
             description = %task.description,
             parent_task_id = ?parent_task_id,
-                "Re-sending TaskStarted for running task after topic history load"
+            tool_call_id = ?task.tool_call_id,
+            state = ?task.state,
+            "Re-sending TaskStarted for task without tool_result after topic history load"
         );
         let _ = sender
             .send(WsOutbound::TaskStarted {
@@ -825,11 +848,10 @@ async fn send_topic_history(
                 subagent_type: task.subagent_type.clone(),
                 topic_id: Some(topic_id.to_string()),
                 parent_task_id,
-                    tool_call_id: None,
+                tool_call_id: task.tool_call_id.clone(),
             })
             .await;
     }
-    }
 
     Ok(())
 }
@@ -846,6 +868,17 @@ async fn send_task_messages(
 
     tracing::info!(session_id = %session_id, message_count = messages.len(), "Sending task messages");
 
+    // 收集已有 tool_result 的 tool_call_id 集合，用于判断子任务是否已有结果
+    let mut tool_call_ids_with_results: std::collections::HashSet<String> =
+        std::collections::HashSet::new();
+    for msg in &messages {
+        if msg.role == "tool" {
+            if let Some(ref tcid) = msg.tool_call_id {
+                tool_call_ids_with_results.insert(tcid.clone());
+            }
+        }
+    }
+
     for msg in messages {
         let mut outbounds = chat_message_to_ws_outbound(&msg);
         if let Some(ref task_id) = subagent_task_id {
@@ -864,11 +897,22 @@ async fn send_task_messages(
         match repo.list_tasks_for_session(session_id).await {
             Ok(child_tasks) => {
                 for child in child_tasks {
-                    if child.state == TaskSessionState::Running {
+                    // 如果该子任务的 tool_call_id 已有对应的 tool_result，前端会显示结果，不需要补发
+                    let has_tool_result = child
+                        .tool_call_id
+                        .as_ref()
+                        .map(|tcid| tool_call_ids_with_results.contains(tcid))
+                        .unwrap_or(false);
+                    if has_tool_result {
+                        continue;
+                    }
+
                     tracing::info!(
                         child_task_id = %child.id,
                         parent_task_id = %parent_task_id,
-                            "Re-sending TaskStarted for child task after sub-agent view re-enter"
+                        tool_call_id = ?child.tool_call_id,
+                        state = ?child.state,
+                        "Re-sending TaskStarted for child task without tool_result after sub-agent view re-enter"
                     );
                     let _ = sender
                         .send(WsOutbound::TaskStarted {
@@ -877,12 +921,11 @@ async fn send_task_messages(
                             subagent_type: child.subagent_type.clone(),
                             topic_id: child.parent_topic_id.clone(),
                             parent_task_id: Some(parent_task_id.clone()),
-                                tool_call_id: None,
+                            tool_call_id: child.tool_call_id.clone(),
                         })
                         .await;
                 }
             }
-            }
             Err(e) => {
                 tracing::warn!(error = %e, session_id = %session_id, "Failed to list child tasks for resend");
             }

src/tools/task/runtime.rs

@@ -727,6 +727,7 @@ impl SubAgentRuntime for DefaultSubAgentRuntime {
             channel_name,
             task.description.clone(),
             task.subagent_type,
+            parent_context.tool_call_id.clone(),
         );
 
         // 4. 在 sessions 表中创建子智能体会话（确保外键约束满足）

src/tools/task/types.rs

@@ -164,6 +164,11 @@ pub struct TaskSession {
     pub summary: Option<String>,
     /// 错误信息
     pub error: Option<String>,
+    /// 触发本任务的 tool_call ID（由 agent_loop 注入）。
+    /// 用于在 topic 历史补发 TaskStarted 时精确匹配前端的 tool_call 卡片，
+    /// 并判断该任务的 tool_result 是否已出现在历史消息中。
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub tool_call_id: Option<String>,
 }
 
 impl TaskSession {
@@ -174,6 +179,7 @@ impl TaskSession {
         parent_channel_name: String,
         description: String,
         subagent_type: SubagentType,
+        tool_call_id: Option<String>,
     ) -> Self {
         let id = format!("task:{}", uuid::Uuid::new_v4());
         let session_id = format!("sub:{}:{}", parent_session_id, id);
@@ -192,6 +198,7 @@ impl TaskSession {
             updated_at: now,
             summary: None,
             error: None,
+            tool_call_id,
         }
     }