Phase 9.78h: Minor cleanup — suppress deprecation warnings for legacy box_trait::ResultBox handling in VM to keep logs clean while migrating to boxes::ResultBox.

src/backend/vm.rs

@@ -1057,6 +1057,8 @@ impl VM {
         }
 
         // ResultBox (box_trait::ResultBox - legacy)
+        {
+            #[allow(deprecated)]
             if let Some(result_box_legacy) = box_value.as_any().downcast_ref::<crate::box_trait::ResultBox>() {
                 match method {
                     "is_ok" | "isOk" => {
@@ -1071,6 +1073,7 @@ impl VM {
                     _ => return Ok(Box::new(VoidBox::new())),
                 }
             }
+        }
 
         // Generic fallback: toString for any Box type
         if method == "toString" {