/**
 * Validates that a file path is safe to pass to `gh gist create`.
 * Rejects paths that:
 *  - Contain `..` path traversal components
 *  - Are absolute paths outside the working directory
 *  - Are symlinks pointing outside the working directory
 *
 * @param filePath  The user-supplied file path
 * @param cwd       The working directory used as the trust boundary
 * @throws Error if the path is unsafe
 */
export declare function assertSafeFilePath(filePath: string, cwd: string): void;
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