/**
 * Deep-frozen snapshot of a plain-object/array graph.
 *
 * v1.8.7 — `withContext` previously shallow-froze the ctx spread, so a
 * policy callback running mid-pipeline could mutate NESTED ctx state
 * (`ctx.user.roles.push('admin')`) and every subsequent policy decision
 * in the same request — including nested-selection target policies —
 * would see the escalated context. This helper delivers the "frozen ctx
 * snapshot" the `withContext` contract documents:
 *
 * - Plain objects and arrays are CLONED recursively and each clone is
 *   frozen. Cloning (rather than freezing in place) means the caller's
 *   original objects stay mutable — freezing shared references would
 *   break auth layers that legitimately mutate their own role arrays
 *   after the request.
 * - Non-plain values (class instances, Dates, Maps, functions) are kept
 *   BY REFERENCE and left unfrozen — freezing them would break their
 *   internal mutation, and they are not part of the record-of-primitives
 *   shape the freeze defends. Policy authors embedding mutable services
 *   in ctx retain responsibility for those objects.
 * - Cycles are preserved via a source→clone map.
 *
 * Note: nested identity is NOT preserved for plain objects (`snapshot.user
 * !== original.user`). Top-level identity was already broken by the
 * `{ ...ctx }` spread, so policies must not rely on reference equality
 * against external state.
 */
export declare function deepFreezeSnapshot<T>(value: T): T;
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