Expanded documentation to reflect the new unified `onSessionUpdate` callback pattern, updated domain model details for session updates, and clarified hook and adapter responsibilities. Added instructions for adding new session update types and described the upsert pattern for message updates. Updated version and last updated date.
Updated AGENTS.md, ARCHITECTURE.md, CLAUDE.md, and GEMINI.md to document the new React Hooks-based architecture. Removed references to Clean Architecture, Use Cases, and ViewModels; added details on custom hooks, updated directory structure, and clarified development patterns and extension points. This reflects the November 2025 refactor for a more React-idiomatic, maintainable, and testable codebase.