Simple MCP Server Toggle System for Minimal Configuration

## Description
We need a lightweight mechanism to easily enable/disable MCP servers without editing complex JSON. Following "Invent and Simplify," this feature would allow users to run with minimal MCP servers based on their current needs.

## Proposed Solution
Create a simple text-based toggle system where users can enable/disable MCP servers through a plain text configuration file, with a small script to apply changes.

## Acceptance Criteria
- Simple text file listing enabled MCP servers
- Script to generate mcp.json based on enabled servers
- Integration with existing setup scripts
- Documentation in README.md

## Implementation Notes
This follows our "spilled coffee" principle while reducing complexity for users who want to run minimal MCP servers.

Start by locating the existing setup scripts and the current MCP configuration flow in the repository. Define the plain-text enabled-server file and script integration so the generated mcp.json reflects its entries, then update README.md and verify the acceptance criteria.

Written by the indexing model from the issue text.