policy.membership_scope_required: Membership doesn't say what it is held in

Membership doesn't say what it is held in.

Area 9, Policy; not declinable; the next step is usually the agent's.

A membership says where its role is held: a reference, or MembershipScope.application:

example

type Handle = Text {    max_length: 40}entity User {    id: Uuid    handle: Handle {        unique: true    }}principal {    user: {        subject: User.handle    }}type StaffRole = Enum {    steward}entity StaffMembership {    id: Uuid    user_id: User.id {        on_delete: OnDelete.cascade    }    role: StaffRole    membership: {        member: user_id        role: role    }}

jadpo checkcheck failed: 1 error, 1 file

error StaffMembership's membership has no scope:

--> main.jadpo:29:5

   |29 |     membership: {   |     ^^^^^^^^^^ no `scope:`

reason: A membership says where a role is held (scope:), who holds it (member:) and which field holds it (role:); scope: is what the role is held in: a field typed <Entity>.id, or MembershipScope.application for a role held across the whole application.
next: Add scope: to the membership (agent)
rule: policy.membership_scope_required
help: https://jadpo.dev/docs/errors/policy.membership_scope_required