fix: cover httpx disconnect family in transient error set

tests/unit/test_governed_llm.py

@@ -259,6 +259,16 @@ async def test_qwen_thinking_stripped():
     assert thinking2 == ""
 
 
+def test_transient_covers_disconnect_family():
+    """瞬时错误清单覆盖断连族（RemoteProtocolError/ReadError/ConnectTimeout/PoolTimeout）。"""
+    from adapters.llm import _is_transient_error
+
+    assert _is_transient_error(httpx.RemoteProtocolError("peer reset"))
+    assert _is_transient_error(httpx.ReadError("read"))
+    assert _is_transient_error(httpx.ConnectTimeout("ct"))
+    assert _is_transient_error(httpx.PoolTimeout("pt"))
+
+
 @pytest.mark.asyncio
 async def test_truncated_stream_without_done_raises():
     """SSE 流耗尽但未收 [DONE] → _SseAnomaly（进重试，不当成功）。"""