Feature/26 improve test coverage

[YagoBorba]

📋 Description

This PR introduces a comprehensive suite of unit tests for the @stackcode/cli package, dramatically increasing test coverage and ensuring the stability and reliability of all core commands. By implementing a robust testing strategy with Vitest, we've created a safety net that enables confident refactoring and future development.

🎯 Key Improvements Implemented:

• Complete Test Coverage: Added tests for the init, config, generate, git, and validate commands.
• Advanced Mocking Strategy: Established a consistent approach for mocking external dependencies like inquirer, fs/promises, and internal @stackcode/core modules, ensuring tests are fast and isolated.
• Complex Flow Validation: The tests for the init and generate commands verify complex, sequential workflows involving user prompts, file system operations, and external command execution.
• Architectural Refactoring: The config command was refactored to support both interactive and non-interactive modes, improving its design and testability.
• CI/CD Confidence: This test suite provides a solid foundation for Continuous Integration, automatically verifying the integrity of the CLI with every change.

🔗 Related Issue

Resolves #26 - Improve and Expand Test Coverage for CLI

🧪 Type of Change

• ✅ Add, update, or pass tests
• ♻️ Refactoring
• 📝 Documentation update
• 🔧 Configuration change
• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 🧹 Code cleanup

📝 How Has This Been Tested?

• Execution of the entire test suite via npm test -w @stackcode/cli.
• All 24 tests are passing successfully across 7 test files.
• The project builds correctly via npm run build.
• Each command's logic was tested in isolation, covering both success and failure scenarios, as well as interactive and non-interactive paths.

📁 Files Changed

✅ New Files:

• packages/cli/test/commands/config.test.ts - Tests for the configuration command.
• packages/cli/test/commands/generate.test.ts - Tests for the file generation command.
• packages/cli/test/commands/init.test.ts - Tests for the complex project initialization command.
• packages/cli/test/commands/git.test.ts - Tests for the git command dispatcher.
• packages/cli/test/commands/validate.test.ts - Tests for the commit message validation command.

🔄 Modified Files:

• packages/cli/src/commands/config.ts - Refactored to separate interactive and non-interactive logic, improving testability.

Issue Reference: Closes #26