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

tests/basic/hello.expected

@@ -0,0 +1 @@
+Hello, world!

tests/basic/hello.go

@@ -0,0 +1,5 @@
+package main
+
+func main() {
+	print("Hello, world!\n")
+}

tests/basic/multiple_prints.expected

@@ -0,0 +1 @@
+First Second

tests/basic/multiple_prints.go

@@ -0,0 +1,8 @@
+package main
+
+func main() {
+	print("First")
+	print(" ")
+	print("Second")
+	print("\n")
+}

tests/basic/print_escape.expected

@@ -0,0 +1,5 @@
+Hello	World!
+Line 1
+Line 2
+Quote: "test"
+Backslash: \

tests/basic/print_escape.go

@@ -0,0 +1,8 @@
+package main
+
+func main() {
+	print("Hello\tWorld!\n")
+	print("Line 1\nLine 2\n")
+	print("Quote: \"test\"\n")
+	print("Backslash: \\\n")
+}