Add `typecheck` script to package.json, expand tsconfig include
paths to cover tests and examples, and update serialization tests
to correctly resolve player IDs from relationship edges.
Replace `any` types with specific interfaces like `WorldEvent`,
`QueryUpdate`, and `Entity` to strengthen type checking. This includes
refining the deserialization logic in `World.fromSnapshot` to use
properly typed component definitions.
Introduce `toJSON` and `fromJSON` methods to the `World` class to
allow saving and restoring world states. This requires components and
relationships to have human-readable names for stable serialization.
hypercross