Allow interface object fields to specify access control (#3333)
Update composition logic to allow specifying access control directives (@authenticated, @requiresScopes and @policy) on @interfaceObject fields. While we disallow access control on interface types and fields, we decided to support it on @interfaceObject as it is a useful pattern to define a single resolver (that may need access controls) for common interface fields. Alternative would require our users to explicitly define resolvers for all implementations which defeats the purpose of @interfaceObject.
This PR refactors in how we propagate access control by providing additional merge sources when merging directives on interfaces, interface fields and object fields.
Fetched April 11, 2026