Network partition behaved as designed: the gateway continued accepting bedside observations
while disconnected from central, fleet ops showed DEGRADED with buffer depth 2, and
reconnecting the Docker network allowed `SyncUploaderService` to drain the backlog within
60 seconds. The partition observation (`partition-exp2-1782245574`) appeared exactly once
on central (count 14 → 15), confirming idempotent sync rather than duplicate rows. This
validates the Phase 23 ops visibility story: charge nurses and IT can see degraded gateways
before data loss occurs, and healing the uplink reconciles without manual intervention.