DL-166

Spawn is one server-side composite CompassService.SpawnAgent RPC orchestrating Provision→Start under a single client_request_id with server-owned end-to-end dedup (retry returns the same session_id, no second container) and a pre-Provision reject-on-live short-circuit ordered after the dedup-join lookup; client-orchestrated two-call flow rejected

Status: Superseded by DL-253 (Matt, 2026-08-25)