docs: add MCP (Model Context Protocol) documentation

[meylis1998]

Description

The CLI has MCP support implemented at /lib/src/mcp/ with 4 tools exposed (create, test, packages_get, packages_check_licenses), but it's not documented anywhere. Users cannot discover or use this feature without prior knowledge.

Motivation

As noted in #1356, MCP integration allows very_good_cli to work seamlessly with AI-assisted developer environments (Claude Desktop, Cursor, GitHub Copilot, etc.). However, the feature is currently hidden.

Proposed Changes

1. Update README.md

Add a new "Model Context Protocol (MCP)" section:

• Brief explanation of MCP support
• Link to detailed documentation
• Quick start example

2. Create /docs/mcp.md

Comprehensive guide including:

• What is MCP? - Brief overview and benefits
• Getting Started - How to start the server (very_good mcp)
• Client Configuration - Examples for popular clients:
  • Claude Desktop (.claude_desktop_config.json)
  • Cursor (.cursor/mcp.json)
  • GitHub Copilot
  • VS Code Copilot
  • Windsurf
• Available Tools - Complete reference for all 4 tools:
  • Tool name, description, parameters, examples
• Use Cases - Practical examples showing AI-assisted workflows
• Troubleshooting - Common issues and solutions
• Experimental Status - Note that MCP support is experimental

3. Add to CHANGELOG.md

Document the MCP feature when released.

Configuration Examples

Claude Desktop:

{
  "mcpServers": {
    "very_good_cli": {
      "command": "very_good",
      "args": ["mcp"]
    }
  }
}

Cursor:

{
  "mcpServers": {
    "very_good_cli": {
      "command": "very_good",
      "args": ["mcp"]
    }
  }
}

Related

• feat: add MCP support #1356 - Original MCP support request
• Model Context Protocol - Anthropic
• Dart & Flutter MCP Server
• Firebase MCP Server

Additional Context

This should be completed before or alongside the experimental MCP release to ensure users can discover and use the feature.