feat(cli): Beautiful CLI with dev command

[prosdev]

Summary

Implements a beautiful, user-friendly CLI for dev-agent with the command.

Features

Commands Implemented

• ✅ **** - Initialize dev-agent configuration
• ✅ **** - Index repository for semantic search
• ✅ **** - Search indexed code semantically
• ✅ **** - Incremental index updates
• ✅ **** - Show indexing statistics
• ✅ **** - Clean indexed data and cache

Beautiful UX

• 🎨 Colored output with chalk (info, success, error, warn)
• ⏳ Spinners with ora for async operations
• 📊 Progress tracking with percentage updates
• 📝 Clear messaging and helpful error suggestions
• 🔧 Config management with .dev-agent.json
• 📤 JSON output option for piping

Testing

• ✅ 133 tests passing (+30 new CLI tests)
• ✅ CLI utilities: 90.9% coverage
• ✅ Logger: 100% coverage
• ✅ Config: 88% coverage
• ✅ CLI structure: 100% coverage

Usage Examples

# Initialize
dev init

# Index your repository
dev index .

# Search semantically
dev search "authentication logic"

# Update incrementally
dev update

# View stats
dev stats

# Clean
dev clean --force

Architecture

CLI Layer (packages/cli/)
├── cli.ts              - Main entry point, commander setup
├── commands/           - 6 command implementations
│   ├── init.ts
│   ├── index.ts
│   ├── search.ts
│   ├── update.ts
│   ├── stats.ts
│   └── clean.ts
└── utils/              - Shared utilities
    ├── logger.ts       - Colored logging (100% coverage)
    └── config.ts       - Config management (88% coverage)

Dependencies

• commander@^12.0.0 - CLI framework
• chalk@^5.3.0 - Terminal colors
• ora@^8.0.1 - Spinners for async operations

Commits

1. chore(cli): add CLI dependencies and setup
2. feat(cli): add logger and config utilities
3. feat(cli): add main CLI entry point
4. feat(cli): implement all CLI commands
5. test(cli): add CLI structure tests
6. docs(cli): add comprehensive CLI documentation

Next Steps

After merge, the CLI is ready for:

• Manual testing with real repositories
• Future: Add logger package (extracted from this)
• Future: Context API server commands

Closes

Closes #6

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Ready for review! The CLI provides a beautiful, functional interface to the dev-agent indexing system.