Add comprehensive design for achieving 100% test coverage through
dependency injection refactoring. The design introduces adapter
interfaces to decouple tool classes from Obsidian API dependencies,
enabling cleaner, more maintainable tests.
Key elements:
- IVaultAdapter, IMetadataCacheAdapter, IFileManagerAdapter interfaces
- Factory pattern for production usage
- Phased implementation approach (adapters → VaultTools → NoteTools → integration)
- Mock adapter pattern for simplified test setup
- Coverage strategy organized by feature areas
Goal: Codebase confidence for future refactoring and feature work.
