/**
 * `memi upgrade` — self-update the standalone binary.
 *
 * Only meaningful when running the prebuilt binary (not the npm install, which
 * upgrades via `npm i -g @memi-design/cli`). Detects the current platform,
 * downloads the latest release archive from GitHub, verifies SHA256, and
 * swaps the binary + sidecar assets atomically.
 */
import type { Command } from "commander";
import type { MemoireEngine } from "../engine/core.js";
export declare function checksumUrlsForArchive(base: string, archiveName: string): string[];
export declare function verifyArchiveChecksum(options: {
    archiveName: string;
    archivePath: string;
    sumsPath: string;
    allowUnverified?: boolean;
}): Promise<"verified" | "unverified-allowed">;
export declare function registerUpgradeCommand(program: Command, _engine: MemoireEngine): void;