Stability checkpoint — SB3 wave 8 Kafka V2 overlay (KafkaConfigTest 4 errors fixed) Pipeline #822 green on main commit 2f0685a. Stable for SB4+Java25 default + SB3 (584 tests passing across the matrix) + SB3+Java17 + SB4+Java21 + SB4+Java17 compat profiles. ADR-0061 entry 4 status updated PENDING → FIXED in this checkpoint. See: https://gitlab.com/mirador1/mirador-service/-/pipelines/2479183478