[Feature Request] Implement the Zmodel `Check` feature into the api check feature

[jasonmacdonald]

[From Discord discussion] (https://discord.com/channels/1035538056146595961/1159194942787293255/1265774955518230579)

Currently, the enhance.model.check feature in preview does not support the check(parent) policy in the schema. If you use check in your model policy, it currently results in Model$checker$create containing an "empty" policy { kind: 'variable', name: '__var0', type: 'boolean' };, whereas the $check_Model_create policy properly delegates to the parent. This feature request is to ensure the consistent functioning of the feature with other policy features.licy it currently results in Model$checker$create containing an "empty" policy { kind: 'variable', name: '__var0', type: 'boolean' }; whereas the $check_Model_create policy properly delegates to the parent. This feature request is to make the feature work consistently with the other policy features