fix: add pythonpath=['.'] to pytest config so CI finds root modules

Tests import from adapters/ and orchestrator at the repo root.
Without pythonpath set, pytest on CI can't resolve them.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: human-again

pyproject.toml

@@ -14,6 +14,7 @@ dev = [
 
 [tool.pytest.ini_options]
 testpaths = ["tests"]
+pythonpath = ["."]
 python_files = ["test_*.py"]
 python_classes = ["Test*"]
 python_functions = ["test_*"]