/**
 * Set of all provider-config keys (canonical + aliases) derived from the
 * central settings registry. Used to filter provider-config settings out of
 * the global ephemerals snapshot so they only appear in provider-scoped sections.
 *
 * @plan PLAN-20260126-SETTINGS-SEPARATION.P09
 */
export declare const PROVIDER_CONFIG_KEYS: ReadonlySet<string>;