build_snapshot now takes now ONLY and derives today = now.date()
inside (P3-1): a single source of truth so the calendar date and
wall-clock time can never disagree across two reads. Coordinator
call site updated.
The expected completed_at in tests/test_core_snapshot.py is now built
from pinned_now.astimezone(datetime.timezone.utc).isoformat() instead
of a literal '+00:00' UTC string (P3-2), so the assertion is
timezone-independent rather than relying on the hass fixture's UTC
timezone.
Pin the coordinator's clock to pinned_now, run async_refresh, and
assert coordinator.data == built (the frozen dataclasses make == a
full deep compare) — the REQUIRED tie-in that proves the coordinator
wrapper actually delegates to build_snapshot, which the literal
assertions alone could not (P2).
overseer
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