chore(fmt): add legacy stubs and strip trailing whitespace to unblock cargo fmt

src/box_factory/user_defined.rs

@@ -1,14 +1,14 @@
 /*!
  * User-Defined Box Factory
- * 
+ *
  * Handles creation of user-defined Box types through InstanceBox
  * Manages inheritance, fields, methods, and birth/fini lifecycle
  */
 
 use super::BoxFactory;
 use crate::box_trait::NyashBox;
-use crate::interpreter::{RuntimeError, SharedState};
 use crate::instance_v2::InstanceBox;
+use crate::interpreter::{RuntimeError, SharedState};
 
 /// Factory for user-defined Box types
 pub struct UserDefinedBoxFactory {
@@ -17,9 +17,7 @@ pub struct UserDefinedBoxFactory {
 
 impl UserDefinedBoxFactory {
     pub fn new(shared_state: SharedState) -> Self {
-        Self {
-            shared_state,
-        }
+        Self { shared_state }
     }
 }
 
@@ -34,31 +32,31 @@ impl BoxFactory for UserDefinedBoxFactory {
             let box_decls = self.shared_state.box_declarations.read().unwrap();
             box_decls.get(name).cloned()
         };
-        
+
         let box_decl = box_decl.ok_or_else(|| RuntimeError::InvalidOperation {
             message: format!("Unknown Box type: {}", name),
         })?;
-        
+
         // Create InstanceBox with fields and methods
         let instance = InstanceBox::from_declaration(
             name.to_string(),
             box_decl.fields.clone(),
             box_decl.methods.clone(),
         );
-        
+
         // TODO: Execute birth/init constructor with args
         // For now, just return the instance
         Ok(Box::new(instance))
     }
-    
+
     fn box_types(&self) -> Vec<&str> {
         // Can't return borrowed strings from temporary RwLock guard
         // For now, return empty - this method isn't critical
         vec![]
     }
-    
+
     fn is_available(&self) -> bool {
         // Always available when SharedState is present
         true
     }
-}
+}