style: drop the redundant parens ruff format flagged

tests/unit/test_thinking.py

@@ -46,9 +46,7 @@ class TestObserveThinking:
 
     def test_positive_token_count_proves_it_happened(self):
         """无正文但上游报了推理用量(qwen 非流式形态)。"""
-        assert (
-            observe_thinking(thinking="", reasoning_tokens=205) is ThinkingObservation.OBSERVED
-        )
+        assert observe_thinking(thinking="", reasoning_tokens=205) is ThinkingObservation.OBSERVED
 
     def test_zero_token_count_is_positive_evidence_of_absence(self):
         """`0` 是"上报了且为零",与"没上报"语义不同,故是 ABSENT 而非 UNKNOWN。"""
@@ -64,8 +62,7 @@ class TestObserveThinking:
     def test_text_outranks_a_zero_count(self):
         """转述与事实冲突时事实赢: 正文在,`reasoning_tokens=0` 不能翻案。"""
         assert (
-            observe_thinking(thinking="想了想", reasoning_tokens=0)
-            is ThinkingObservation.OBSERVED
+            observe_thinking(thinking="想了想", reasoning_tokens=0) is ThinkingObservation.OBSERVED
         )