Terminology

Rivet Engine - The binary running everything related to Rivet
Client - the user/app connecting to Rivet
Runner - the client-side runner code
Runner Protocol - Rivet <-> Runner communication protocol defined as BARE (see engine/sdks/schemas/runner-protocol)
Runner WF - the rivet-side runner, manages runner lifecycle
Actor WF - rivet-side actor
Gateway - A portion of Guard responsible for proxying requests and websockets to actors running on runners
Runner WS - The runner connects to this to communicate to Rivet