Tags: Cqsi/lichs

Fix pytest import path in CI (add pythonpath = .)

Bare 'pytest' (used in both workflows) did not put the repo root on
sys.path, so 'import lichs' failed during collection. Running via
'python -m pytest' locally masked this.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>