Add comprehensive test system for Go-to-Zig compiler

- Implement end-to-end test runner for compilation and behavior tests
- Add test cases for basic print functionality
- Refactor translator to use proper AST generation
- Remove redundant programs directory in favor of tests

Makefile

@@ -1,5 +1,15 @@
 run:
 	go run internal/main.go -o hello.zig programs/hello.go && zig run hello.zig
 
-test:
+test: test-unit test-integration
+
+test-unit:
 	go test ./internal/zig
+
+test-integration:
+	go run ./cmd/testrunner
+
+test-quick:
+	go run ./cmd/testrunner
+
+.PHONY: run test test-unit test-integration test-quick