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Stable identity on wire: - ServerID fields in proto (replica_server_id, server_id on ReplicaAddrMessage) - volumeServerId wired through volume.go → BlockService.SetServerID - Identity derived from canonical server ID, not transport addresses Assignment convergence: - V2 idempotence via lastAppliedAssignment.equals (full replica set comparison) - setupPrimaryReplication/Multi idempotence guards - ProcessAssignments with V2 + V1 dual-path assignment handling Master-driven control loop: - RecoveryManager: serialized cancel-and-drain via done channels - Per-replica heartbeat state reporting (ReplicaShipperStatus) - masterServerBackend: VolumeBackend calling real MasterServer in-process - RestoreBlockSnapshot RPC (master + volume server proto) QA tests (P10 P1-P4): - Identity: ServerID on wire, fail-closed on missing - Convergence: assignment delivery, epoch monotonicity, registry coherence - Idempotence: repeated assignment, multi-replica set comparison - Control loop: integrationMaster + real allocator + proto round-trip Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>