feat(09-03): compile ordered Winter form schemas

- Strict config_form and fields documents keep source order and JSON scalar types
- Unknown keys, partials, path escape, and a mismatched modelClass fail activation with plugin context
- List-only controllers still activate when config_form.yaml is absent

cabana/registry.go

@@ -49,10 +49,15 @@ func compileRegistry(items []controllerRef) (*Registry, error) {
 		if err != nil {
 			return nil, err
 		}
+		form, err := compileFormIfPresent(item.plugin.ID(), item.ctl, assets.AdminFS())
+		if err != nil {
+			return nil, err
+		}
 		byID[id] = &CompiledController{
 			PluginID:   item.plugin.ID(),
 			Controller: item.ctl,
 			List:       list,
+			Form:       form,
 		}
 	}
 	return &Registry{byID: byID}, nil