/**
 * Walkthrough prompt — agent-led tour of compact-agent.
 *
 * Invoked via `/walkthrough` (or `/tour` / `/guide`). Returns a prompt that
 * puts the assistant into Onboarding Guide mode for the rest of the session
 * (until the user runs `/clear` or switches modes). The guide leads the user
 * through the canonical command surface — no duplicates, no ECC-vs-built-in
 * choices to make.
 */
export declare function buildWalkthroughPrompt(): string;