pytest fails with ImportError when Typer is present

[malandrina]

Steps to reproduce:

1. rm -rf tests/fixtures/ineligible to make tests/nuanced/code_graph_test::test_init_with_no_eligible_files_returns_errors fail
2. Run pytest and confirm test_init_with_no_eligible_files_returns_errors fails with ImportError: cannot import name 'PythonLexer' from 'pygments.lexers.python'
3. Run the following commands to remove Typer from the virtual env and reactivate:

% deactivate
% uv remove typer
% source .venv/bin/activate

4. Run pytest and confirm test_init_with_no_eligible_files_returns_errors fails with AssertionError