Enhanced Knowledge Graph Memory Server

# Utils Module Reusable utility functions used across the application. ## Contents - `levenshtein.ts` - String distance calculation for fuzzy matching - `tfidf.ts` - TF-IDF algorithms for relevance scoring - `dateUtils.ts` - Date range parsing and validation - `validationUtils.ts` - Data validation helpers - `pathUtils.ts` - File path management and backward compatibility ## Characteristics All utilities are: - **Pure functions** - No side effects - **Well-tested** - 100% code coverage - **Documented** - Clear JSDoc with examples - **Independent** - No circular dependencies