Pins the v1.4.40 W-DELETED contract end-to-end against the real
Postgres testcontainer. Three contracts:
1. The slim summaries slice's narrow aggregate + DISTINCT ON latest
reads exclude tombstoned rows. Fixture parks a 99.0 sentinel
row that would explode min/max if leaked.
2. The dashboard summary route's per-type groupBy + latestIn7d
DISTINCT ON ignore the tombstone — the WEIGHT tile's
`latestValue` shows the live row, not the tombstoned 99.0.
3. `recomputeBucketsForMeasurement` produces a DAY bucket with
count=2 (not 3) when one of three same-day rows is soft-
deleted, and the bucket mean reflects the live two rows only.
Also pins the Coach snapshot's measurement read against the same
filter — tombstoned rows must never reach the AI prompt where they
would surface as live data the user thinks they removed.
Marc-André Bombeck
55fefb1d72