## Implementation Complete ### What was done: - Added 11 tests for `render_workflow_ascii_with_highlight` function in `tests/test_visualization.py`: - Test highlighting by step key, number, and name (case insensitive) - Test unknown step shows "not found" message - Test custom config directory support - Test only specified step is highlighted - Added 8 tests for CLI `visualize` command in `tests/test_cli.py`: - Test --help displays correct usage - Test without --step shows workflow diagram - Test --step highlights by key, number, and name - Test unknown step shows not found message ### Verification: - `make test` passes (720 tests) - Coverage on `visualization.py`: **100%** - All acceptance criteria met: - ✅ `make test` passes - ✅ Coverage includes `visualization.py` (100%) - ✅ Tests verify graph structure matches config