specifies classes in the data model, raising these to from `_class`
model attributes to `subModuleWith`'s `class` parameter where possible.

note: resource policy has remained as to use `deferredModuleWith`
(rather than `submoduleWith`) to ensure evaluation will go thru.

@@ -132,2 +139,2 @@
-              description = ''
-                Resources made available by the hosting provider, and their policies.
+      type = attrsOf (submoduleWith {
+        class = "fediversity-environment";

@@ -31,6 +33,7 @@ let
       inputs.nixops4.modules.nixops4Deployment.default
 
       {
+        _class = "nixops4Deployment";