diff --git a/src/daemon/dispatcher.py b/src/daemon/dispatcher.py
index c3092b9..980fe9d 100644
--- a/src/daemon/dispatcher.py
+++ b/src/daemon/dispatcher.py
@@ -718,15 +718,23 @@ class Dispatcher:
             return True
 
     def _mark_task_status(self, db_path: Path, task_id: str, status: str) -> None:
-        """更新任务状态"""
+        """更新任务状态 + 写审计事件"""
         try:
             conn = get_connection(db_path)
             try:
                 conn.execute("BEGIN IMMEDIATE")
+                old_row = conn.execute(
+                    "SELECT status FROM tasks WHERE id=?", (task_id,)
+                ).fetchone()
+                old_status = old_row["status"] if old_row else "unknown"
                 conn.execute(
                     "UPDATE tasks SET status=?, updated_at=datetime('now') WHERE id=?",
                     (status, task_id),
                 )
+                conn.execute(
+                    "INSERT INTO events (task_id, event_type, payload) VALUES (?, 'status_change', ?)",
+                    (task_id, f'{{"from": "{old_status}", "to": "{status}", "source": "auto_complete"}}'),
+                )
                 conn.commit()
             finally:
                 conn.close()