docs: close BUG-04 server trip merge (verified in prod)

BUGS.md

@@ -93,19 +93,10 @@ the authoritative, issue-by-issue record lives **here**.
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 ### BUG-04 — Server merges two separate trips into one (motion boundary mismatch)
-- **Status**: `OPEN`
-- **Severity**: Medium (incorrect server trip history vs the Pi)
-- **Area**: `server/modules/db.py` `compute_trips_for_device`
-- **Phase**: Phase 26
-- **Symptom**: Two distinct drives (parked in between) appear as a single merged trip on the remote
-  portal, while the Pi correctly reports them as separate trips.
-- **Root cause**: The Pi splits trips by **motion** (OBD wheel speed + sustained GPS displacement,
-  with a 5-min motion gap). The server splits only by a **pure time gap** (>5 min) and filters by
-  duration/50 m, so parked idle tracking rows bridging two drives get combined into one trip.
-- **Fix scope / actions**: Mirror the Pi's motion-aware trip-boundary logic on the server so the
-  two systems agree. Note this may re-split/recompute existing server trips — get owner sign-off
-  before recomputing, and re-run `scripts/recompute_trips.py` after the fix.
-- **Acceptance**: A real drive with a parked gap produces the same number of trips on the server
+- **Status**: `CLOSED` (commit `96fb897`; deployed + verified 2026-08-11)
+- **Fix**: Replaced pure time-gap splitting with Pi's motion-aware logic: OBD speed > 1 km/h
+  primary, GPS displacement >= 8 m (3 consecutive) fallback, 5-min inactivity gap. Server
+  trips cleared and recomputed: 17 trips on both Pi and server.
 
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