fix: 修复消息持久化缺失 topic 关联和 assistant 文本丢失

- PersistingEmittedMessageHandler 新增 topic_id 参数，使用 append_message_with_topic 替代 append_message
- agent_loop 的所有退出路径中为最终 assistant 文本添加 emit_live_tool_call_message
- 更新 finalize_result filter，live_emitter 存在时抑制所有消息的 post-loop 广播

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/agent/agent_loop.rs

@@ -663,6 +663,7 @@ pub struct PersistingEmittedMessageHandler<H: EmittedMessageHandler> {
     inner: H,
     conversation_repository: Arc<dyn ConversationRepository>,
     session_id: String,
+    topic_id: Option<String>,
 }
 
 impl<H: EmittedMessageHandler> PersistingEmittedMessageHandler<H> {
@@ -670,8 +671,9 @@ impl<H: EmittedMessageHandler> PersistingEmittedMessageHandler<H> {
         inner: H,
         conversation_repository: Arc<dyn ConversationRepository>,
         session_id: impl Into<String>,
+        topic_id: Option<String>,
     ) -> Self {
-        Self { inner, conversation_repository, session_id: session_id.into() }
+        Self { inner, conversation_repository, session_id: session_id.into(), topic_id }
     }
 }
 
@@ -679,7 +681,7 @@ impl<H: EmittedMessageHandler> PersistingEmittedMessageHandler<H> {
 impl<H: EmittedMessageHandler> EmittedMessageHandler for PersistingEmittedMessageHandler<H> {
     async fn handle(&self, message: ChatMessage) {
         if let Err(e) = self.conversation_repository
-            .append_message(&self.session_id, &message)
+            .append_message_with_topic(&self.session_id, self.topic_id.as_deref(), &message)
         {
             tracing::error!(error = %e, session_id = %self.session_id,
                 "Failed to persist emitted message");
@@ -915,6 +917,7 @@ impl AgentLoop {
                     let assistant_message =
                         ChatMessage::assistant(recoverable_llm_message(&e.to_string()));
                     emitted_messages.push(assistant_message.clone());
+                    self.emit_live_tool_call_message(assistant_message.clone()).await;
                     return Ok(AgentProcessResult {
                         final_response: assistant_message,
                         emitted_messages,
@@ -939,6 +942,7 @@ impl AgentLoop {
                     ChatMessage::assistant(response.content)
                 };
                 emitted_messages.push(assistant_message.clone());
+                self.emit_live_tool_call_message(assistant_message.clone()).await;
                 return Ok(AgentProcessResult {
                     final_response: assistant_message,
                     emitted_messages,
@@ -1044,6 +1048,7 @@ impl AgentLoop {
                     tool_call.name,
                 ));
                 emitted_messages.push(assistant_message.clone());
+                self.emit_live_tool_call_message(assistant_message.clone()).await;
                 return Ok(AgentProcessResult {
                     final_response: assistant_message,
                     emitted_messages,
@@ -1120,6 +1125,7 @@ impl AgentLoop {
                     ChatMessage::assistant(response.content)
                 };
                 emitted_messages.push(assistant_message.clone());
+                self.emit_live_tool_call_message(assistant_message.clone()).await;
                 Ok(AgentProcessResult {
                     final_response: assistant_message,
                     emitted_messages,
@@ -1135,6 +1141,7 @@ impl AgentLoop {
                 );
                 let final_message = ChatMessage::assistant(recoverable_llm_message(&e.to_string()));
                 emitted_messages.push(final_message.clone());
+                self.emit_live_tool_call_message(final_message.clone()).await;
                 Ok(AgentProcessResult {
                     final_response: final_message,
                     emitted_messages,

src/gateway/execution.rs

@@ -157,11 +157,8 @@ impl AgentExecutionService {
                 .emitted_messages
                 .iter()
                 .filter(|message| {
-                    // 当存在 live_emitter 时，工具调用和工具结果已在 loop 中实时广播
-                    // 只保留最终 assistant 文本通过 post-loop 路径发送
-                    let already_emitted = request.suppress_live_tool_calls
-                        && (message.is_assistant_tool_call_message() || message.role == "tool");
-                    !already_emitted
+                    // 当存在 live_emitter 时，所有消息已在 loop 中实时广播，不需要 post-loop 发送
+                    !request.suppress_live_tool_calls
                         && should_display_message_to_user(self.show_tool_results, message)
                 })
                 .flat_map(|message| {

src/gateway/processor.rs

@@ -227,6 +227,7 @@ impl InboundProcessor {
             ),
             self.session_manager.store(),
             &session_id,
+            current_topic.clone(),
         ));
 
         match self

src/tools/task/runtime.rs

@@ -236,6 +236,7 @@ impl DefaultSubAgentRuntime {
                     },
                     self.conversation_repository.clone(),
                     session.session_id.clone(),
+                    session.parent_topic_id.clone(),
                 ));
 
                 return agent.with_emitted_message_handler(emitter);