Quick-reference recap of commands, env vars, shortcuts, or formulas grouped by topic. Visually distinct from `data-table` by intent: a cheat-sheet is for rapid scanning at the end of a tutorial (label → value lookups), where data-table is for prose-tabular comparison with explicit headers. Two variants: `card-grid` lays group-cards out in a 2- or 3-column grid; `dense-table` renders a single-column recap with bolded labels and right-aligned values.