Cluster

Cluster guides cover the multi-node control plane: membership, downing, placement, and entity sharding. Start with membership before wiring sharding, because sharding depends on a running cluster-aware agent and an agreed membership view.

Guide	What it covers
Membership	datum-cluster member states, SWIM/foca gossip, downing, node sessions, and job placement
Sharding	datum-cluster-sharding entities, EntityRef, rebalance, passivation, and delivery semantics