✅ Add comprehensive test suite

[Robdel12]

Summary

• Add extensive test coverage across the entire codebase
• Include unit, integration, and component tests
• Improve code quality and reliability through comprehensive testing

Changes

• ✅ Add CLI and command tests (tests/cli.spec.js, tests/commands/)
• ✅ Add SDK tests (tests/sdk/)
• ✅ Add server handler tests (tests/server/handlers/)
• ✅ Add HTTP server tests (tests/server/http-server.spec.js)
• ✅ Add service layer tests (tests/services/)
• ✅ Add utility tests (tests/utils/, tests/unit/)
• ✅ Update existing integration tests
• 📊 18 new test files with 5,700+ lines of test coverage

Test Coverage

• CLI argument parsing and validation
• All command modules (init, run, tdd, upload)
• SDK core functionality
• Server handlers and HTTP server
• Service layer (API, server manager, test runner)
• Utility functions and helpers

Test plan

• Run the new test suite: npm test
• Verify all tests pass
• Check test coverage reports
• Ensure no existing functionality is broken