Fix code formatting to pass CI/CD quality gates

- Apply black formatting to test files
- Fix import sorting with isort
- Ensure consistent code style across codebase

This resolves CI/CD pipeline failures in quality gate checks.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jeremymanning

htfa/results.py

@@ -5,7 +5,7 @@
 and NIfTI reconstruction capabilities.
 """
 
-from typing import Any, Dict, List, Optional, TYPE_CHECKING
+from typing import TYPE_CHECKING, Any, Dict, List, Optional
 
 import warnings
 

tests/conftest.py

@@ -5,9 +5,8 @@
 import os
 import sys
 import tempfile
-from pathlib import Path
-
 import time
+from pathlib import Path
 
 import numpy as np
 import pytest

tests/e2e/test_full_pipeline.py

@@ -1,6 +1,5 @@
 """End-to-end tests for complete HTFA workflows."""
 
-
 import numpy as np
 import pytest
 

tests/integration/test_fit_interface.py

@@ -5,8 +5,6 @@
 without mocks to ensure the entire pipeline works correctly.
 """
 
-
-
 import numpy as np
 import pytest
 

tests/unit/test_validation.py

@@ -1,6 +1,5 @@
 """Comprehensive tests for HTFA validation framework."""
 
-
 import json
 import tempfile
 from pathlib import Path