/**
 * Write a file atomically: write to .tmp then rename.
 * Prevents partial writes from corrupting the target file.
 * @param filePath - Target file path
 * @param content - File content
 * @param mode - File permissions (default: 0o600 for secret files)
 */
export declare function atomicWriteFile(filePath: string, content: string, mode?: number): void;
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