export declare function v3DistillationScratchRoot(parent?: string, uid?: number | undefined): string;
/**
 * Create the Linux host-only scratch root under `/tmp`. Every historical
 * Botmux bwrap plan mounts a fresh tmpfs at `/tmp` before exposing the CLI, so
 * even already-running sandbox namespaces from an older binary cannot observe
 * these host bytes. The uid-qualified 0700 directory also rejects pre-creation
 * or symlink substitution by another local user.
 */
export declare function ensureV3DistillationScratchRoot(parent?: string): string;
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