fix(agent): report progress during long tool runs

tests/test_agent_progress_updates.py

@@ -0,0 +1,19 @@
+from unittest.mock import patch
+
+from app.agent.prompt import prompt_manager
+from app.core.config import settings
+from app.schemas.types import MessageChannel
+
+
+def test_non_verbose_prompt_keeps_long_running_tasks_user_visible() -> None:
+    """非详细模式下的长任务仍应主动向用户提供阶段性进度。"""
+    with patch.object(settings, "AI_AGENT_VERBOSE", False):
+        prompt = prompt_manager.get_agent_prompt(
+            channel=MessageChannel.WebAgent.value
+        )
+
+    assert "before the first tool call" in prompt
+    assert "after a meaningful milestone or several tool calls" in prompt
+    assert "Continue working after each update" in prompt
+    assert "remain completely silent" not in prompt
+    assert "DO NOT output any intermediate content" not in prompt