test: expand golden C-codegen tests from 2 to 8 examples

Add golden tests for: structs, generics, algebraic_enums, enums,
methods, strings. Each test captures the expected C output from the
bootstrap compiler for regression detection.

Also remove leftover 'PARSER FIX V2 ACTIVE' debug print from parser.bux.

tests/golden/algebraic_enums/bux.toml

@@ -0,0 +1,7 @@
+[Package]
+Name    = "algebraic_enums"
+Version = "0.1.0"
+Type    = "bin"
+
+[Build]
+Output = "Bin"

tests/golden/algebraic_enums/src/Main.bux

@@ -0,0 +1,29 @@
+// Algebraic Enums - Enums with data (tagged unions)
+import Std::Io::{PrintLine, PrintInt};
+
+
+enum Result {
+    Ok(int),
+    Err(String)
+}
+
+func Main() -> int {
+    let r1: Result = Result { tag: Result_Ok };
+    r1.data.Ok_0 = 42;
+    
+    let r2: Result = Result { tag: Result_Err };
+    r2.data.Err_0 = "error message";
+    
+    if r1.tag == Result_Ok {
+        PrintLine("r1 is Ok:");
+        PrintInt(r1.data.Ok_0);
+        PrintLine("");
+    }
+    
+    if r2.tag == Result_Err {
+        PrintLine("r2 is Err:");
+        PrintLine(r2.data.Err_0);
+    }
+    
+    return 0;
+}