test: Implement comprehensive workspace isolation to protect user projects

- Add isolate_workspace autouse fixture in conftest.py.
- Monkeypatch SLOP_CONFIG and preset paths to point to a temporary test directory.
- Update test_history_management.py to use dynamic paths.get_config_path().
- Prevents tests from accidentally reading or modifying the active project.toml or config.toml.

tests/test_history_management.py

@@ -28,11 +28,10 @@ def test_aggregate_includes_segregated_history() -> None:
 def test_mcp_blacklist() -> None:
  """Tests that the MCP client correctly blacklists files"""
  from src import mcp_client
- from src.models import CONFIG_PATH
- # CONFIG_PATH is usually something like 'config.toml'
- assert mcp_client._is_allowed(Path("src/gui_2.py")) is True
+ from src import paths
  # config.toml should be blacklisted for reading by the AI
- assert mcp_client._is_allowed(Path(CONFIG_PATH)) is False
+ assert mcp_client._is_allowed(Path("src/gui_2.py")) is True
+ assert mcp_client._is_allowed(paths.get_config_path()) is False
 
 def test_aggregate_blacklist() -> None:
  """Tests that aggregate correctly excludes blacklisted files"""