feat(mcp): Implement complete MCP client and server with official features

Adds complete Model Context Protocol (MCP) client and server implementations with all official features, including sampling, roots, and elicitation. Implements a hybrid architecture for multi-server coordination and improved resilience.

- Implements official MCP client features: sampling, roots, and elicitation
- Implements official MCP server features: tools, resources, and prompts
- Introduces hybrid MCP architecture with central and per-agent fallback strategies
- Adds VS Code commands for MCP server status, root management, and elicitation settings
- Implements dynamic agent registry for auto-discovery and health monitoring
- Includes detailed documentation and implementation notes

Author: olasunkanmi-SE