import type { TerminationEnvelopeV1 } from "../contracts/index.js";
/**
 * Atomically persist the termination envelope for a governed run.
 *
 * Crash-safe write sequence (mirrors exit-signal.ts atomic publication):
 *   1. Write complete JSON to a unique tmp file (wx, 0o600) in runDirectory
 *   2. Sync and close the tmp file
 *   3. Hard-link tmp → termination.json (EEXIST → slot already occupied)
 *   4. On EEXIST, read and return the existing envelope
 *   5. Unlink the tmp file in finally (best-effort)
 *
 * First terminal exit path wins — competing callers that hit EEXIST get back
 * the envelope that won the race.  This is the A1 idempotency guarantee.
 */
export declare function persistTerminationEnvelope(runDirectory: string, envelope: TerminationEnvelopeV1): Promise<TerminationEnvelopeV1>;