state-machines

State machines and workflow patterns — XState v5 (createMachine, createActor, context, events, guards, actions, invoke, delayed transitions, type-safe machines), XState + React (useActor, useSelector, actor context pattern, multi-step form wizards, authentication flows, testing), workflow patterns (order processing, approval workflows, retry with exponential backoff, saga pattern with compensation, pipeline pattern), finite automata (hierarchical/nested states, parallel states, history states, always transitions, final states, actor model/spawning), event-driven architecture (event sourcing, CQRS, event stores with optimistic concurrency, projections, snapshots, domain events, event versioning), and process orchestration (Temporal.io workflows/activities/signals/queries, simple workflow engine, database-backed job queues with SKIP LOCKED). 6 skills, 3 commands, 1 agent. No dependencies.