- 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.
Applied 236 return type annotations to functions with no return values
across 100+ files (core modules, tests, scripts, simulations).
Added Phase 4 to python_style_refactor track for remaining 597 items
(untyped params, vars, and functions with return values).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>