/**
 * Create a temporary file with secure permissions.
 * Returns the file path. Caller is responsible for cleanup.
 */
export declare function createSecureTempFile(content: string, prefix: string): string;
/**
 * Delete a temporary file, logging a warning (instead of throwing) if the
 * deletion fails. Used by callers that generate secret-bearing temp files
 * (SSH keys, credential helper scripts) whose cleanup should never crash the
 * caller — a failed deletion is unfortunate but not fatal to the operation
 * that created the file.
 */
export declare function safeUnlink(filePath: string, warnMessage: string): void;
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