[FIX]: Suppress confusables invalid escape sequence warnings in pytest

[spencrr]

Description

On a clean virtual environment (first run, no .pyc cache), pytest emits a
DeprecationWarning (Python 3.11–3.13) or SyntaxWarning (Python 3.14+) from the third-party confusables package

This is mainly so CI passes cleanly on first run.

(see Test (Python 3.11) and others)

confusables/init.py:46: DeprecationWarning: invalid escape sequence '*' space_regex = "[*_~|`-.]*" if include_character_padding else

Verify

rm -rf .venv && uv venv --python 3.13 && uv sync --locked && pytest tests for python 3.11-3.14

Breaking changes

None

Checklist

• pre-commit run --all-files passes
• Tests added or updated for changes
• Documentation updated