style: fix code formatting and linting issues

- Fix whitespace in docstrings and blank lines
- Remove unused variables in tests
- Rename unused loop variables to follow conventions
- All ruff checks now pass

Signed-off-by: Hal <hal.long@outlook.com>

tests/test_dependency_resolver.py

@@ -1,10 +1,14 @@
 """Tests for dependency resolver functionality."""
 
-import pytest
 from unittest.mock import AsyncMock, patch
 
-from pypi_query_mcp.tools.dependency_resolver import DependencyResolver, resolve_package_dependencies
+import pytest
+
 from pypi_query_mcp.core.exceptions import InvalidPackageNameError, PackageNotFoundError
+from pypi_query_mcp.tools.dependency_resolver import (
+    DependencyResolver,
+    resolve_package_dependencies,
+)
 
 
 class TestDependencyResolver:
@@ -71,7 +75,7 @@ class TestDependencyResolver:
             mock_client.get_package_info.return_value = mock_package_data
 
             result = await resolver.resolve_dependencies(
-                "test-package", 
+                "test-package",
                 python_version="3.11"
             )
 

tests/test_package_downloader.py

@@ -1,13 +1,16 @@
 """Tests for package downloader functionality."""
 
-import pytest
-from pathlib import Path
-from unittest.mock import AsyncMock, patch, mock_open
-import tempfile
 import shutil
+import tempfile
+from unittest.mock import AsyncMock, mock_open, patch
 
-from pypi_query_mcp.tools.package_downloader import PackageDownloader, download_package_with_dependencies
-from pypi_query_mcp.core.exceptions import InvalidPackageNameError, PackageNotFoundError
+import pytest
+
+from pypi_query_mcp.core.exceptions import InvalidPackageNameError
+from pypi_query_mcp.tools.package_downloader import (
+    PackageDownloader,
+    download_package_with_dependencies,
+)
 
 
 class TestPackageDownloader:
@@ -218,25 +221,6 @@ class TestPackageDownloader:
     @pytest.mark.asyncio
     async def test_download_package_with_dependencies_function(self, temp_download_dir):
         """Test the standalone download_package_with_dependencies function."""
-        mock_package_data = {
-            "info": {
-                "name": "test-package",
-                "version": "1.0.0",
-                "requires_python": ">=3.8",
-                "requires_dist": []
-            },
-            "releases": {
-                "1.0.0": [
-                    {
-                        "filename": "test_package-1.0.0-py3-none-any.whl",
-                        "url": "https://files.pythonhosted.org/packages/test_package-1.0.0-py3-none-any.whl",
-                        "packagetype": "bdist_wheel",
-                        "md5_digest": "abc123",
-                        "size": 1024
-                    }
-                ]
-            }
-        }
 
         with patch('pypi_query_mcp.tools.package_downloader.PackageDownloader') as mock_downloader_class:
             # Setup downloader mock