/**
 * squad upstream — CLI commands for managing upstream Squad sources.
 *
 * Commands:
 *   squad upstream add <source> [--name <name>] [--ref <branch>]
 *   squad upstream remove <name>
 *   squad upstream list
 *   squad upstream sync [name]
 *
 * @module cli/commands/upstream
 */
export declare function upstreamCommand(args: string[]): Promise<void>;
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