/**
 * Serialize untrusted prompt context without circular-reference crashes or
 * unbounded output.
 *
 * Contract: NATIVE JSON.stringify value semantics — property enumeration,
 * toJSON() (Date → ISO string, custom canonicalizers), arrays, primitives —
 * stay with the engine. This wrapper only:
 *   (a) maps bigint to an "Nn" string (native stringify throws on bigint),
 *   (b) replaces true ancestor-path cycles with '[Circular]',
 *   (c) enforces the output-size cap on the FINAL serialized string.
 *
 * DAG-aware (EP002-R2): a WeakSet of every visited object misclassifies a
 * repeated reference (the same contract reachable via two separate paths —
 * e.g. `intentContract` and `scribeArtifact.intentContract`) as a cycle and
 * would emit '[Circular]' where the LLM needs the content. Cycle detection
 * therefore tracks the CURRENT ancestor path only: an object re-entered while
 * still on the path is a true cycle (replaced, bounded); an object reached
 * again after its subtree completed serializes in full.
 *
 * Implemented as a JSON.stringify replacer instead of a manual walker so
 * non-plain objects keep native semantics: the engine applies toJSON() BEFORE
 * calling the replacer, so a Date arrives already converted and is never
 * re-enumerated into '{}'. The replacer runs pre-order over the serialization
 * tree with `this` = the object whose property is being emitted; unwinding the
 * ancestor stack to `this` on every call pops the previous sibling's completed
 * subtree — exactly the exit signal a flat WeakSet lacks.
 */
export declare function serializePromptInput(value: unknown): string;
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