- Add @t3tools/core package with Effect-based domain model
- Add @t3tools/infra-sqlite package for SQLite persistence
- Add CoreRuntime to server integrating the new packages
- Remove client-side persistence (persistenceSchema.ts, store.test.ts)
- Simplify web store by delegating persistence to server
- Update contracts with new IPC and WebSocket message types

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