fix: exclude .pyi from ruff + fix unused variable in test

pyproject.toml

@@ -34,6 +34,7 @@ module = "easy_tdx.MyTT"
 [tool.ruff]
 target-version = "py310"
 line-length = 100
+extend-exclude = ["*.pyi"]
 
 [tool.ruff.lint]
 select = ["E", "F", "I", "UP"]

tests/unit/test_backtest_engine.py

@@ -548,7 +548,7 @@ def test_chanlun_manual_result_overrides_auto():
     # Pass explicit result — should NOT auto-compute
     manual_result = {"manual": True}
     engine = BacktestEngine(CheckerStrategy, cash=100000, chanlun_level="DAILY")
-    result = engine.run(df, chanlun_result=manual_result)
+    engine.run(df, chanlun_result=manual_result)
 
     # Strategy should have received the manual result, not auto-computed one
     assert CheckerStrategy.received == manual_result