/**
 * --help-extra resolver and renderer.
 *
 * When --help-extra is passed, renders skill documentation for the command group.
 *
 * Strategy (hybrid):
 * 1. Runtime primary: if skills/ directory is accessible, read and render full markdown.
 * 2. Runtime fallback: use the built-in summary strings (works in compiled binaries).
 *
 * Skill map: command group → relevant skill files.
 */
/**
 * Show extended help for a command group.
 *
 * Writes to stdout (so it can be piped / paged).
 */
export declare function showHelpExtra(group: string): Promise<void>;
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