/**
 * Resolve the installed @nauth-toolkit/core version at runtime.
 *
 * Walks up from the compiled file location (dist/utils at runtime, src/utils
 * under ts-jest) for up to three levels looking for the package's own
 * package.json. Reading at runtime keeps the reported version in sync with
 * the published package — a compiled-in constant would go stale because the
 * release script bumps versions outside the TypeScript build.
 *
 * Never throws; returns 'unknown' when the manifest cannot be found or read.
 *
 * @returns The semver version string of @nauth-toolkit/core, or 'unknown'
 */
export declare function getCoreVersion(): string;
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