- Add `.cargo/config.toml` with target directory and rustflags configuration.
- Remove devenv files and set up Nix flake configuration with `flake.nix` and `flake.lock`.
- Add dependencies on `blake3`, `digest`, and hashing-related crates for content hashing functionality.
- Implement `EntityId` as hashed representation and `ContentHash` component using Blake3.
- Add `hashing_serializer` module for serializing and hashing components.
- Remove unused `parser` module and restructure lib.rs with new `Reference` type and storage interfaces.
- Add test files for `store` and `reference` functionality with TODOs for implementation.
- Introduce `VanthPlugin` skeleton and entity save/load interfaces with placeholder implementations.
- Add `Reference` type with retrieval state machine and async handling stubs.
- Added new modules `entity` and `store` to `vanth` crate for ECS foundations
- Implemented generic `Id` type with serialization/deserialization support
- Introduced `serde` and `serde_json` dependencies in workspace and vanth crate
- Defined `Vanth` struct and `ContentHash` component in `lib.rs`
- Added placeholder `Store` component in new module
- Updated workspace configuration with `resolver = "3"` and dependency versions
The `entity_count` method in the `Node` struct now correctly returns the
number of entities in the world by querying for all entities. I've removed
the `todo!()` macro which was preventing proper compilation and execution.
