Add MCP Support to 'list' and 'info' Commands (#85)

## Summary

Implements comprehensive MCP (Model Context Protocol) support for the
struct tool as requested in issue #75.

## Changes Made

### Core MCP Implementation
- **MCP Server**: Added `struct_module/mcp_server.py` with full stdio
transport support
- **MCP Command**: Added `struct_module/commands/mcp.py` for starting
MCP server
- **Dependencies**: Added `mcp` package to requirements.txt

### MCP Tools Implemented
1. **list_structures**: List all available structure definitions
2. **get_structure_info**: Get detailed information about a specific
structure
3. **generate_structure**: Generate structures with various options
(supports console output for AI workflows)
4. **validate_structure**: Validate structure configuration YAML files

### Enhanced Commands
- **list command**: Added `--mcp` flag for MCP integration
- **info command**: Added `--mcp` flag for MCP integration
- Both commands maintain full backward compatibility

### AI-Assisted Development Support
- Console output mode for structure generation enables AI prompt
chaining
- MCP tools can be used programmatically for automated workflows
- Enhanced documentation with workflow examples

### Testing & Documentation
- Complete test suite in `tests/test_mcp_integration.py` (9 test cases,
all passing)
- Comprehensive documentation in `docs/mcp-integration.md`
- Updated README.md with MCP feature highlights

## Usage Examples

```bash
# Start MCP server
struct mcp --server

# Use MCP integration in existing commands
struct list --mcp
struct info project/python --mcp
```

## Benefits

✅ **Automation**: Programmatic access to all struct tool functionality  
✅ **Integration**: Easy integration with AI tools and development
workflows
✅ **Backward Compatibility**: All existing functionality remains
unchanged
✅ **Comprehensive**: Covers all major struct operations (list, info,
generate, validate)
✅ **Well-Tested**: Full test coverage with 9 test cases  
✅ **Documented**: Complete usage guide and examples  

## Addresses

Closes #75

## Testing

- [x] All existing tests pass (44/44)
- [x] New MCP integration tests pass (9/9)
- [x] Manual testing of MCP server and CLI integration
- [x] Verified backward compatibility

## Assignee
@httpdss

Author: httpdss

README.md

@@ -15,6 +15,7 @@
 - **🪝 Automation Hooks** - Pre and post-generation shell commands
 - **🎯 Dry Run Mode** - Preview changes before applying them
 - **✅ Validation & Schema** - Built-in YAML validation and IDE support
+- **🤖 MCP Integration** - Model Context Protocol support for AI-assisted development workflows
 
 ## 🚀 Quick Start
 
@@ -39,8 +40,41 @@ struct list
 
 # Validate a configuration
 struct validate my-config.yaml
+
+# Start MCP server for AI integration
+struct mcp --server
+ ```
+
+### 🤖 MCP Integration Quick Start
+
+Struct supports MCP (Model Context Protocol) for seamless AI tool integration:
+
+```bash
+# 1. Start the MCP server
+struct mcp --server
+
+# 2. Configure your AI tool (Claude Desktop example)
+# Add to ~/.config/claude/claude_desktop_config.json:
+{
+  "mcpServers": {
+    "struct": {
+      "command": "struct",
+      "args": ["mcp", "--server"]
+    }
+  }
+}
+
+# 3. Use MCP tools in your AI conversations:
+# - list_structures: Get all available structures
+# - get_structure_info: Get details about a structure
+# - generate_structure: Generate project structures
+# - validate_structure: Validate YAML configs
 ```
 
+**Supported MCP Clients:** Claude Desktop, Cline/Continue, Custom clients
+
+[📖 Full MCP Integration Guide](docs/mcp-integration.md)
+
 ### Example Configuration
 
 ```yaml
@@ -87,6 +121,7 @@ Our comprehensive documentation is organized into the following sections:
 - **[Hooks](docs/hooks.md)** - Pre and post-generation automation
 - **[Mappings](docs/mappings.md)** - External data integration
 - **[GitHub Integration](docs/github-integration.md)** - Automation with GitHub Actions
+- **[MCP Integration](docs/mcp-integration.md)** - Model Context Protocol for AI-assisted workflows
 - **[Command-Line Completion](docs/completion.md)** - Enhanced CLI experience
 
 ### 👩‍💻 Development