Tighten the transport so device data lands on the right day and in the
right slot.
- Cumulative daily totals (steps, distance, energy, floors) now key their
measuredAt and stats:<tag>:<day> external id off the interval's civil
start date anchored at UTC-midday, not the physical instant. Keying off
the physical instant put a positive-UTC-offset user's day one calendar
day early and split the same local day across the Google, Apple, and
Fitbit sources so neither won the per-day source pick.
- Thread the user's timezone through the sleep, workout, and interval
parses so an offset-less wall-clock timestamp resolves in the user's
zone rather than the process zone — the same fix the classic Fitbit
sleep path already carries.
- Drop skin temperature from the launch set. Google reports a signed
nightly deviation from baseline, not an absolute reading, so mapping it
into the absolute wrist-temperature slot stored a delta as a
temperature and dropped every cold-night negative. It returns once a
signed-delta model exists.
- Remove the unused daily-rollup read path and field-map, and the
experimental ECG and irregular-rhythm scopes that had no reader — the
connect flow now requests exactly the four core scopes it uses.