export interface CoreSourceStamp {
    source: string;
    ref: string;
    last_sync_sha: string;
    last_sync_at: string;
}
/** Read the same per-field source-then-staging fallback used by the old yq path. */
export declare function readCoreSourceStamp(content: string): CoreSourceStamp;
/** Write the stamp and verify the complete resulting file from disk. */
export declare function writeCoreSourceStamp(coreYamlPath: string, stamp: CoreSourceStamp): void;
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