feat: create scoped language functions from native calls

crates/objects/src/native.rs

@@ -58,6 +58,20 @@ impl<'a> NativeContext<'a> {
         self.allocate(crate::Record)
     }
 
+    /// Build a language function under this native scope using validated code.
+    pub fn new_function(
+        &mut self,
+        name: impl Into<String>,
+        code: ObjectRef,
+        globals: ObjectRef,
+    ) -> Result<ObjectRef, VmError> {
+        let function = self
+            .store
+            .new_function(name, code, globals, vec![], vec![])?;
+        self.roots.push(function);
+        Ok(function)
+    }
+
     pub fn new_dict(&mut self) -> Result<ObjectRef, VmError> {
         let object = self.store.new_dict()?;
         self.roots.push(object);