vm(compare): fix BoxRef(IntegerBox) comparisons by upstream casts and fallbacks; unify IntegerBox (re-export); as_bool truthiness; NewBox primitive fastpath; phi minimal fallback; add temp debug logs for route tracing

src/tests/vm_compare_box.rs

@@ -0,0 +1,13 @@
+#[test]
+fn vm_compare_integerbox_boxref_lt() {
+    use crate::backend::vm::VM;
+    use crate::backend::vm::VMValue;
+    use crate::box_trait::IntegerBox;
+    use std::sync::Arc;
+    
+    let vm = VM::new();
+    let left = VMValue::BoxRef(Arc::new(IntegerBox::new(0)));
+    let right = VMValue::BoxRef(Arc::new(IntegerBox::new(3)));
+    let out = vm.execute_compare_op(&crate::mir::CompareOp::Lt, &left, &right).unwrap();
+    assert!(out, "0 < 3 should be true");
+}