CI shards exposed what the dev DATA_DIR was masking locally: detect.test.ts
and managementCliToken.test.ts asserted 401/403/reject outcomes that only
exist when login protection is configured — on a fresh CI DB isAuthRequired()
is false and the policy anonymous-allows. Both now create an isolated
DATA_DIR with requireLogin+password (the established pattern).
observability-fase04: the breaker reset-timeout test ran with a 5ms margin
(resetTimeout 10 / sleep 15) — lazy HALF_OPEN refresh under shard contention
flipped the first OPEN assert. Now 250/300ms.