Move presence.py, materialize.py, completion.py, events.py, children.py,
quest_definitions.py, admin_allowlist.py and service_policy.py into
custom_components/nestquest/core/, leaving re-export shims at the
original paths so the integration keeps working unchanged.
core/events.py is refactored to PAYLOAD CONSTRUCTION ONLY: it builds
and returns (event_type, payload) tuples and never touches hass.bus or
hass.config. The HA-local 'today' the day-complete rule needs is now a
parameter (read from hass.config.time_zone by the integration shim).
The events.py shim retains fire_quest_completed/fire_quest_uncompleted,
wiring the returned events to hass.bus.async_fire so the four event
names and payload shapes stay identical (nestquest_quest_completed with
was_on_time, nestquest_quest_uncompleted, nestquest_child_day_complete
with quests_due/quests_completed, occurred_at strict UTC ISO-8601).
Update two test logger-name references (children now logs as
...core.children) and the materialize _now_stamp monkeypatch target
(now patches the core module the walk reads globals from).
1497 passed (baseline). No homeassistant import under core/, no
top-level core import under the integration, no repo-root core/.
overseer