move rhai wrappers of models from rhailib

heromodels/examples/legal_contract_example.rs

@@ -73,7 +73,7 @@ fn main() {
 
     // The `#[model]` derive handles `created_at` and `updated_at` in `base_data`.
     // `base_data.touch()` might be called internally by setters or needs explicit call if fields are set directly.
-    // For builder pattern, the final state of `base_data.updated_at` reflects the time of the last builder call if `touch()` is implicit.
+    // For builder pattern, the final state of `base_data.modified_at` reflects the time of the last builder call if `touch()` is implicit.
     // If not, one might call `contract.base_data.touch()` after building.
 
     println!("\n--- Initial Contract Details ---");