listUsers discovers user IDs for assignments, subscriptions, project membership, and leads.
automations/find-linear-user.automation.ts
email, case-insensitive name substring, active, and includeDisabled. Common page inputs are limit (1–50, default 50), after, and includeArchived; account defaults to the project binding.
Returns { users: LinearUser[]; pageInfo: LinearPageInfo }. includeDisabled controls the candidate set, while active filters it by active state.