Provides a generic key-value store abstraction with composable views (MapView, RegisterView, LogView, etc.) and multiple backends (Memory, RocksDB, ScyllaDB, IndexedDB). Used by all Linera applications for persistent state management. The trait-based design allows easy swapping of storage backends and is isolated enough to be extracted for other projects needing a similar abstraction.

Implements WIT (WebAssembly Interface Types) generation and runtime support for Wasmer and Wasmtime. Provides derive macros for WitType, WitLoad, WitStore, and a WIT interface writer. This framework is self-contained and can be reused in any Rust project that needs to generate WIT bindings for Wasm modules.

Implements a hash-consing cache for content-addressed data (blocks, blobs, certificates) that allows move-in/move-out without cloning. The cache is thread-safe and uses a simple API. This pattern is reusable for any system that needs deduplication of immutable objects by hash.

Provides macros `bcs_scalar!` and `doc_scalar!` for defining GraphQL scalars that serialize via BCS (Binary Canonical Serialization) and display as hex strings. These macros are small, self-contained, and can be reused in any Rust project using async-graphql that needs custom scalar types with BCS encoding.

Defines a `Persist` trait for loading and saving data to files or memory, with implementations for common types. This is a minimal, reusable persistence abstraction that can be extracted for any project needing simple file-based or in-memory persistence.