Move state management from client to server using an event-sourced architecture:
- Add SQLite-backed event store with append-only event log
- Add orchestration engine with command queue, reducer, and read model
- Add Effect-based PubSub for real-time read model updates to clients
- Define orchestration schemas in contracts (commands, events, read model)
- Simplify client-side store by removing persistence layer
- Remove obsolete client-side persistence tests

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>