augment-it grows a backbone — workspace, services, and a message bus that boots

Phase 1 of the augment-it rewrite landed today. Three containers come up cleanly with one command: a NATS message bus, a thin Workspace Service that owns no domain data, and a row-store microservice that owns its own rows. The shape of every future service is set; the wire is now visibly a microservices wire instead of point-to-point HTTP. The in-app chat surface has something real to plug into.