The test files imported from `tests.utils` (non-existent) and `tests.conftest.OmniServerParams` (not lazy-exported), causing pytest collection to fail for the whole suite. This broke unrelated CI jobs (Diffusion Cache Backend Test, Simple Unit Test) because collection runs across all test files even when they are deselected by marker. Align with the pattern used by sibling TTS tests (e.g. test_cosyvoice3_tts.py, test_voxcpm.py): - hardware_test -> tests.helpers.mark - OmniServerParams -> tests.helpers.runtime https://claude.ai/code/session_01JYESRH7Ua1mc1wqKCQQs5q