Fix: Use os.pathsep for TROVE_PATHS splitting to support Windows

[Ged-fi]

Fixes issue where Windows drive letters (like C:) were improperly split when parsing TROVE_PATHS.

[gemini-code-assist]

Code Review

This pull request updates the _parse_paths function in config.py to use os.pathsep instead of a hardcoded colon, improving cross-platform compatibility for directory path parsing. The reviewer suggested adding unit tests to verify this OS-dependent logic and provided a comprehensive code example for testing both POSIX and Windows scenarios using mocks.

[gemini-code-assist]

While this change correctly uses os.pathsep for cross-platform compatibility, the _parse_paths function lacks unit tests. Given that its behavior is OS-dependent, adding tests would be valuable to ensure it works as expected on different platforms (e.g., POSIX and Windows) and to prevent future regressions.

Consider adding a new test file, for example tests/test_config.py, with tests that mock os.pathsep to verify the parsing logic.

Here's an example of what these tests could look like:

# In a new file tests/test_config.py
import os
from unittest import mock
from mcp_trove_crunchtools.config import _parse_paths

def test_parse_paths_posix():
    """Test path parsing with POSIX-style separator."""
    with mock.patch('os.pathsep', ':'):
        raw_paths = "/home/user/docs:/data/files"
        expected = ["/home/user/docs", "/data/files"]
        assert _parse_paths(raw_paths) == expected

def test_parse_paths_windows():
    """Test path parsing with Windows-style separator."""
    with mock.patch('os.pathsep', ';'):
        raw_paths = r"C:\\Users\\user\\docs;D:\\data"
        expected = [r"C:\\Users\\user\\docs", r"D:\\data"]
        assert _parse_paths(raw_paths) == expected

def test_parse_paths_empty_and_whitespace():
    """Test that empty or whitespace-only input returns an empty list."""
    assert _parse_paths("") == []
    assert _parse_paths("   ") == []

def test_parse_paths_with_empty_segments():
    """Test that empty segments in the path string are ignored."""
    with mock.patch('os.pathsep', ':'):
        raw_paths = "/path/one::/path/two:"
        expected = ["/path/one", "/path/two"]
        assert _parse_paths(raw_paths) == expected