Run the storage/engines/business stack end-to-end in a subprocess that
has no homeassistant installed: open a fresh SQLite file, apply
migrations, create two children and a daily quest definition with a
morning window, materialize over 28 days, complete one instance via
the panel actor, and derive its state as 'done'. The subprocess stubs
the parent custom_components.nestquest package (a bare ModuleType
whose __path__ points at the real directory) into sys.modules WITHOUT
executing its HA-importing __init__, so importing the core subpackage
is a genuine no-HA proof rather than one masked by conftest's global
HA mocks.
Guards the storage/engines/business extraction (tasks d0b691d8 /
510c1f78 / 4dd8f870) from regressing into a HA-coupled bundle.
overseer
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