DL-313
NATS is the single eventing substrate — run as a standalone stack service (alongside Postgres and the OTel collector) in every deployment, reached over nats://, with no embedded/in-process mode and no transport phase; single-node or clustered NATS is selected by connection string, never by application code. JetStream is the durable comms-delivery transport; core NATS carries routing/binding invalidation; queue groups partition delivery work. Connect stays the synchronous RPC edge; the agent↔Runner hop stays vsock (RIG-2394); no LISTEN/NOTIFY phase. Supersedes DL-014 and DL-021 (RIG-2861 OQ-1)
Status: Active (Matt, 2026-08-31)