export interface ShareMeta {  /** Page <title> and index link text */  title: string;  /** URL slug — must match the filename in shares/ */  slug: string;  /** ISO date string YYYY-MM-DD */  date: string;  /** Short blurb for the index */  description: string;  /** Tags for filtering / future search */  tags?: readonly string[];  /** Visibility on the index page */  audience?: 'public' | 'unlisted';}