hashFromExportId
export function hashFromExportId(id: string): string | undefined { const m = /^h_([a-z2-7]{52})$/.exec(id); return m?.[1]; }
export function hashFromExportId(id: string): string | undefined { const m = /^h_([a-z2-7]{52})$/.exec(id); return m?.[1]; }