Enhanced Knowledge Graph Memory Server

# Features Module Advanced feature implementations for the Memory MCP Server. ## Contents - `TagManager.ts` - Tag operations and alias management - `ImportanceManager.ts` - Importance level operations - `HierarchyManager.ts` - Parent-child entity relationships - `AnalyticsManager.ts` - Statistics and graph validation - `CompressionManager.ts` - Duplicate detection and merging - `ArchiveManager.ts` - Criteria-based archiving - `import-export/` - Multi-format import/export handlers ## Feature Categories ### Tags & Metadata - Tag CRUD operations - Tag aliases for synonyms - Bulk tag operations - Importance levels (0-10 scale) ### Hierarchy - Parent-child relationships - Ancestry traversal - Subtree extraction - Cycle detection ### Optimization - Duplicate detection (similarity scoring) - Entity merging - Graph compression - Archiving by age/importance/tags ### Analytics - Graph statistics - Validation reports - Orphaned relation detection ### Import/Export - JSON, CSV, GraphML, GEXF, DOT, Markdown, Mermaid - Multiple merge strategies - Dry-run mode for safety