fix: bound chat latency and clarify blackjack flow

tests/test_jwebot_edge.py

@@ -1736,7 +1736,7 @@ class DirectClientTests(unittest.TestCase):
                 )
             )
             response = mock.MagicMock()
-            response.read.return_value = (
+            response.read1.return_value = (
                 'data: {"choices":[{"delta":{"content":"正"}}]}\n\n'
                 'data: {"choices":[{"delta":{"content":"常"}}]}\n\n'
                 "data: [DONE]\n\n"
@@ -1782,6 +1782,55 @@ class DirectClientTests(unittest.TestCase):
         finally:
             temporary.cleanup()
 
+    def test_stream_reader_stops_at_done_without_waiting_for_eof(self):
+        response = mock.MagicMock()
+        response.read1.side_effect = [
+            b'data: {"choices":[{"delta":{"content":"ok"}}]}\n'
+            b"data: [DO",
+            b"NE]\n\n",
+            AssertionError("reader continued after the stream completed"),
+        ]
+
+        raw = MODULE.read_direct_api_response(response)
+
+        self.assertEqual(
+            raw,
+            b'data: {"choices":[{"delta":{"content":"ok"}}]}\n'
+            b"data: [DONE]\n\n",
+        )
+        self.assertEqual(response.read1.call_count, 2)
+
+    def test_stream_reader_does_not_treat_content_as_done_marker(self):
+        response = mock.MagicMock()
+        response.read1.side_effect = [
+            b'data: {"choices":[{"delta":{"content":"data: [DONE]"}}]}\n\n',
+            b"data: [DONE]\n\n",
+            AssertionError("reader continued after the stream completed"),
+        ]
+
+        raw = MODULE.read_direct_api_response(response)
+
+        self.assertIn(b'"content":"data: [DONE]"', raw)
+        self.assertTrue(raw.endswith(b"data: [DONE]\n\n"))
+        self.assertEqual(response.read1.call_count, 2)
+
+    def test_stream_reader_enforces_total_wall_time(self):
+        response = mock.MagicMock()
+        response.read1.return_value = b": keep-alive\n\n"
+        with mock.patch.object(
+            MODULE.time,
+            "monotonic",
+            side_effect=[0.0, 0.0, 31.0],
+        ):
+            with self.assertRaisesRegex(
+                MODULE.DeepSeekUnavailable,
+                "exceeded total timeout",
+            ):
+                MODULE.read_direct_api_response(response)
+
+        response.fp.raw._sock.settimeout.assert_called_once_with(18.0)
+        response.read1.assert_called_once()
+
     def test_stream_parser_accepts_a_non_streaming_compatibility_payload(self):
         self.assertEqual(
             MODULE.deepseek_response_content(