The actor and provider engine was renamed from "actor system" to "actor engine" to say what it is: the one host-agnostic engine that browser, CLI, worker, and dapp hosts all drive. See ARCHITECTURE.md.

Migrating

Replace the dependency and the import specifier:

pnpm remove @ariestools/actor-system
pnpm add @ariestools/actor-engine

Then rename the symbols — every ActorSystem* export became ActorEngine*, and actorSystem* became actorEngine*:

Before	After
`launchActorSystem`	`launchActorEngine`
`startActorSystem`	`startActorEngine`
`createActorSystemDependencyScope`	`createActorEngineDependencyScope`
`describeActorSystemPlan`	`describeActorEnginePlan`
`renderActorSystemBoot`	`renderActorEngineBoot`
`compileActorSystem`	`compileActorEngine`
`launchCompiledActorSystem`	`launchCompiledActorEngine`
`ActorSystemActor`	`ActorEngineActor`
`ActorSystemCatalog`	`ActorEngineCatalog`
`ActorSystemSession`	`ActorEngineSession`
`parallelActorSystemSupervision`	`parallelActorEngineSupervision`
`sequentialActorSystemSupervision`	`sequentialActorEngineSupervision`

While this alias package is installed, both spellings resolve, so the dependency swap and the symbol rename can land separately. The alias contains no independent launcher, resolver, or supervisor.

ActorEngineTerminalFailureCode keeps its pre-rename value, actor-system.terminal-failure. It is a wire code carried across realm boundaries, so it is deliberately not renamed with the symbols.