feat: add UTM plugin for virtual machine management

[luke]

Summary

• Adds a new plugin for managing UTM virtual machines on macOS
• Integrates with utmctl CLI to control VMs
• Provides a clean UI for VM management

Features

✅ UTM Installation Detection

• Checks for UTM.app and utmctl CLI
• Shows installation guide if not found
• Displays version information

✅ VM Management

• List all virtual machines with status
• Start, stop, and suspend operations
• Shows VM architecture and backend type (QEMU/Apple)

✅ TypeScript API

• Full type definitions for all operations
• Clean async/await interface
• Comprehensive error handling

✅ Professional UI

• Follows Agent54 design system
• Responsive VM cards with status indicators
• Smooth loading and error states

Technical Details

• Uses Tauri's shell plugin to execute utmctl commands
• Supports multiple UTM installation paths
• Generic type parameters for Tauri runtime compatibility
• Includes comprehensive test scripts

Testing

The plugin includes test scripts in test-scripts/ that can be run from the dev console:

const tests = await import('@agent54/plugin-utm/test-scripts/test-utm.js')
await tests.default.runAllTests()

Phase 2 Features (Future)

• VM creation wizard
• Live screenshots
• Resource monitoring
• USB passthrough
• Snapshot management

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