- Introduced type-safe access methods for shared cache in the Main process, including `getShared`, `setShared`, `hasShared`, and `deleteShared`.
- Implemented `getAllShared` for initializing new Renderer windows with the complete shared cache state.
- Updated IPC communication to support bidirectional synchronization of shared cache between Main and Renderer processes.
- Enhanced cache management with absolute timestamps for TTL, ensuring precise expiration handling across windows.
- Added ready state tracking in Renderer for improved synchronization feedback during initialization.
- Refactored related documentation to reflect new features and usage patterns for shared cache.
- Revised the README files for shared data and main data layers to improve clarity and structure.
- Consolidated documentation on shared data types and API types, removing the now-deleted `api-design-guidelines.md`.
- Streamlined directory structure descriptions and updated links to relevant documentation.
- Enhanced quick reference sections for better usability and understanding of the data architecture.
