Increase pytest workers from 4 to 10

Matches the number of E2E/integration test files for optimal
parallelization. Reduces test runtime from ~3:49 to ~3:06.

Author: Nils Bars

tests/pytest.ini

@@ -9,13 +9,13 @@ markers =
     unit: marks tests as unit tests
     offline: marks tests that can run without REF
     needs_ref: marks tests that require REF to be running
-addopts = -v --tb=short -n 4 --dist loadfile --cov=helpers --cov-report=term-missing --cov-report=html:coverage_reports/htmlcov --cov-report=xml:coverage_reports/coverage.xml
+addopts = -v --tb=short -n 10 --dist loadfile --cov=helpers --cov-report=term-missing --cov-report=html:coverage_reports/htmlcov --cov-report=xml:coverage_reports/coverage.xml
 filterwarnings =
     ignore::DeprecationWarning
 timeout = 300
 
-# Parallel execution with pytest-xdist (default: 4 workers with loadfile distribution)
-# Override workers: pytest -n auto (auto-detect CPUs) or pytest -n 8
-# Disable parallel: pytest -n 0
+# Parallel execution with pytest-xdist (default: 10 workers with loadfile distribution)
+# 10 workers matches the number of E2E/integration test files for optimal parallelization
+# Override workers: pytest -n auto (auto-detect CPUs) or pytest -n 0 (serial)
 # Each worker gets its own REF instance for E2E tests
 # loadfile keeps all tests from the same file on one worker (preserves cross-class state)