bug(slm-tests): test_wizard_inventory_parity_14286.py's ad-hoc loader breaks on services.role_manifest_shape import #17164

Problem

autobot-slm-backend/tests/services/test_wizard_inventory_parity_14286.py fails at collection, standalone, unrelated to any change in this session:

tests/services/test_wizard_inventory_parity_14286.py:121: in <module>
    _ib, _rr, _pe, _wiz = _load()
tests/services/test_wizard_inventory_parity_14286.py:96: in _load
    role_registry = _real_module("_rr_14286", _BACKEND_ROOT / "services" / "role_registry.py")
tests/services/test_wizard_inventory_parity_14286.py:56: in _real_module
    spec.loader.exec_module(module)
services/role_registry.py:21: in <module>
    from services.role_manifest_shape import default_roles_for
E   ModuleNotFoundError: No module named 'services.role_manifest_shape'; 'services' is not a package

Cause (as far as static reading shows)

_real_module() loads services/role_registry.py directly via importlib.util.spec_from_file_location, bypassing services/__init__.py (presumably to avoid its own heavy imports, same reason other test files in this dir do this). But role_registry.py itself does a package-relative from services.role_manifest_shape import default_roles_for -- that resolves only if sys.modules['services'] is already registered as a proper package (with __path__), which this ad-hoc load never sets up.

Confirmed unrelated to #17150/#17163 (playbook_executor.py's ansible_dir caching fix): zero diff between origin/main and that PR's branch for role_registry.py, role_manifest_shape.py, or this test file itself. Reproduced standalone: python3 -m pytest autobot-slm-backend/tests/services/test_wizard_inventory_parity_14286.py.

Not yet determined

Whether this also fails in CI's python-suite shards (I could not check without derailing a priority task) or is masked there by shard/collection order, a conftest that pre-populates sys.modules['services'], or an environment difference from my local repro. Leaving that unticked rather than guessing.

Acceptance criteria

• test_wizard_inventory_parity_14286.py collects and its tests run cleanly in a fresh interpreter, standalone.
• Confirm whether this fails in CI today as well, or only locally, and say why.