fix: todo_write 持久化从 finalize_result 移到 BusToolCallEmitter，即时触发

之前持久化挂在 agent 全部完成后，长任务永远等不到。
现在每个 todo_write 工具调用完成时立即持久化到 SQLite。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/gateway/execution.rs

@@ -190,12 +190,6 @@ impl AgentExecutionService {
         // 只有当是最新回合时才触发历史压缩
         let should_schedule_compaction = is_current_turn;
 
-        // 拦截 todo_write 结果：持久化 + 前端推送（不受 is_current_turn 限制）
-        session.intercept_todo_write_results(
-            &request.result.emitted_messages,
-            request.chat_id,
-        );
-
         Ok(FinalizedAgentResult {
             outbound_messages,
             should_schedule_compaction,

src/gateway/processor.rs

@@ -255,6 +255,7 @@ impl InboundProcessor {
                 inbound.channel.clone(),
                 inbound.chat_id.clone(),
                 emitter_metadata,
+                self.session_manager.store(),
             ),
             self.session_manager.store(),
             &session_id,

src/gateway/session.rs

@@ -55,6 +55,7 @@ pub struct BusToolCallEmitter {
     channel_name: String,
     chat_id: String,
     metadata: HashMap<String, String>,
+    store: Arc<SessionStore>,
 }
 
 impl BusToolCallEmitter {
@@ -63,12 +64,14 @@ impl BusToolCallEmitter {
         channel_name: impl Into<String>,
         chat_id: impl Into<String>,
         metadata: HashMap<String, String>,
+        store: Arc<SessionStore>,
     ) -> Self {
         Self {
             bus,
             channel_name: channel_name.into(),
             chat_id: chat_id.into(),
             metadata,
+            store,
         }
     }
 }
@@ -107,6 +110,55 @@ impl EmittedMessageHandler for BusToolCallEmitter {
                 tracing::error!(error = %error, channel = %self.channel_name, chat_id = %self.chat_id, "Failed to publish live outbound tool call");
             }
         }
+
+        // 拦截 todo_write 结果：即时持久化到 SQLite
+        if message.tool_name.as_deref() == Some("todo_write") {
+            self.persist_todo_write_result(&message);
+        }
+    }
+}
+
+impl BusToolCallEmitter {
+    /// 从 todo_write 工具结果中提取 todos 并持久化
+    fn persist_todo_write_result(&self, message: &ChatMessage) {
+        let parsed: serde_json::Value = match serde_json::from_str(&message.content) {
+            Ok(v) => v,
+            Err(_) => return,
+        };
+
+        let Some(todos_array) = parsed.get("current_todos").and_then(|v| v.as_array()) else {
+            return;
+        };
+
+        let session_id = crate::storage::persistent_session_id(&self.channel_name, &self.chat_id);
+        let scope_key = &session_id;
+
+        let records: Vec<crate::storage::TodoRecord> = todos_array
+            .iter()
+            .filter_map(|item| {
+                Some(crate::storage::TodoRecord {
+                    id: item.get("id")?.as_str()?.to_string(),
+                    scope_key: scope_key.clone(),
+                    session_id: session_id.clone(),
+                    topic_id: None,
+                    content: item.get("content")?.as_str()?.to_string(),
+                    status: item.get("status")?.as_str()?.to_string(),
+                    priority: item.get("priority")?.as_str()?.to_string(),
+                    created_at: item.get("created_at")?.as_i64()?,
+                    updated_at: item.get("updated_at")?.as_i64()?,
+                })
+            })
+            .collect();
+
+        tracing::info!(
+            scope_key = %scope_key,
+            todo_count = records.len(),
+            "BusToolCallEmitter: persisting todo_write result"
+        );
+
+        if let Err(e) = self.store.replace_todos(scope_key, &records) {
+            tracing::warn!(error = %e, %scope_key, "Failed to persist todo list from BusToolCallEmitter");
+        }
     }
 }
 
@@ -1907,6 +1959,7 @@ mod tests {
 
     #[tokio::test]
     async fn test_bus_tool_call_emitter_emits_completed_tool_results() {
+        let store = Arc::new(SessionStore::in_memory().unwrap());
         let bus = MessageBus::new(4);
         let emitter =
             BusToolCallEmitter::new(
@@ -1914,6 +1967,7 @@ mod tests {
                 "test-channel",
                 "chat-1",
                 HashMap::new(),
+                store,
             );
 
         emitter