/**
 * Task 1461 — resolve the owner `AdminUser` userId for a target account.
 *
 * A sub-account is seeded (Task 1359 `seedAccountGraphRoot`) with exactly one
 * `AdminUser` carrying `role:'owner'`. That owner is the single, unambiguous
 * identity a cross-account profile op attributes its read/write to — the
 * caller's boot `USER_ID` (a house operator) has no node in the sub-account
 * subgraph, so keying the profile on it reads empty and writes an orphan.
 *
 * Returns null when the account has no owner `AdminUser` (an unprovisioned
 * graph root): the caller rejects loudly rather than attributing the write to a
 * wrong or absent identity.
 */
export declare function resolveOwnerUserId(accountId: string): Promise<string | null>;
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