⚡ Remove pytest parallel execution flag from CI tests

Removes -n auto flag to disable pytest-xdist parallel test execution.
This likely addresses test reliability issues or resource constraints in
the CI environment where parallel execution was causing problems.

Author: Nick Sullivan

.github/workflows/build.yml

@@ -121,7 +121,7 @@ jobs:
           uv pip install --system -e .
 
       - name: Run the tests with coverage
-        run: pytest -n auto --cov=aicodebot --cov-report=xml --cov-report=term-missing
+        run: pytest --cov=aicodebot --cov-report=xml --cov-report=term-missing
 
       - name: Upload coverage to Codecov
         if: matrix.python-version == '3.13'