test(integration): pin soft-delete invisibility across analytics, dashboard, rollup tiers

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.

src/lib/ai/coach/snapshot.ts

@@ -497,6 +497,7 @@ async function buildCoachSnapshotImpl(
             userId,
             type: { in: wantedTypes as never[] },
             measuredAt: { gte: cutoff },
+            deletedAt: null,
           },
           orderBy: { measuredAt: "asc" },
           select: { type: true, value: true, measuredAt: true },