Fix ruff lint errors in DeepEval tests and conftest

Fix import sorting and unused import warning in conftest.py and
test_deepeval_analysis.py.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Hooman Mehr

tests/conftest.py

@@ -1,5 +1,6 @@
 """Shared test fixtures and markers for baft tests."""
 import os
+
 import pytest
 
 os.environ.setdefault("DEEPEVAL_TELEMETRY_OPT_OUT", "YES")
@@ -14,7 +15,7 @@ def _ollama_available() -> bool:
 
 def _deepeval_available() -> bool:
     try:
-        import deepeval
+        import deepeval  # noqa: F401
         return True
     except ImportError:
         return False

tests/test_deepeval_analysis.py

@@ -9,6 +9,7 @@
 Skip: uv run pytest tests/ -m "not deepeval"
 """
 import pytest
+
 from tests.conftest import skip_no_deepeval
 
 pytestmark = [pytest.mark.deepeval, skip_no_deepeval]