fix: include cmd package tests in Makefile test targets

The test-unit target was only running ./internal/... tests, excluding
all CLI command tests in the cmd package. This meant that 47 tests in
cmd/{delete,deploy,diff,root}_test.go were not being executed by the
standard development workflow.

Updated test-unit target to run both ./cmd/... and ./internal/... tests,
ensuring complete test coverage in make test and make commit-check.

Author: orien

Makefile

@@ -57,7 +57,7 @@ test: test-unit ## Run all tests
 
 test-unit: ## Run unit tests
 	@echo "🧪 Running unit tests..."
-	@go test -v ./internal/...
+	@go test -v ./cmd/... ./internal/...
 
 test-aws: build-test-aws ## Run AWS module test program (dry-run)
 	@echo "🔍 Testing AWS module..."