Optimized Memory MCP Server V2

# MCP Server Bug Fix Tasks ## Database Schema and Migration Issues - [x] Task 1: Fix database initialization for test environments - Add missing table creation migrations in alembic - Ensure test database gets properly initialized - Verify SQLite configuration for tests - [x] Task 2: Complete model attribute definitions - Add missing fields to models: - Provider: Add 'namespace' field - Relationship: Add 'relationship_type' and 'source_id' fields - Observation: Add 'observation_type' field - Update model constructors - Add field validations - Update model tests ## MCP Resource Implementation - [x] Task 3: Fix entity resource parameter handling - Update get_entity resource function signature to match MCP protocol - Ensure proper MCP context usage - Add error handling for invalid entity IDs - Update resource tests ## Test Infrastructure - [x] Task 4: Improve test database setup - Create proper test database initialization - Add test data fixtures - Implement database cleanup between tests - Add comprehensive model validation tests ## Documentation - [x] Task 5: Update documentation for model changes - Document new model fields - Update example MCP resource usage - Add database migration instructions Priority Order: 1. Database Schema (Task 1) 2. Model Fixes (Task 2) 3. MCP Resource Implementation (Task 3) 4. Test Infrastructure (Task 4) 5. Documentation (Task 5) Note: All implementation should follow MCP SDK conventions and avoid any web framework dependencies.