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The expressiveness gap between engine output and hand-written XML came down to two missing capabilities, both generic: - Block layout inside a box: nested containers already existed, but there was no way to split space by weight, pin a child to an edge, or tighten padding. Added grow (flex-grow over the parent's leftover flow-axis space, TeX's glue), align (start/center/end/stretch on the cross axis) and pad (per-group interior padding). All three round-trip via dai_grow/dai_align/ dai_pad markers. - Inline rich text: labels already render HTML (html=1 on every style, esc() entities decode back), but the measure pass counted markup as text. The visibleText() strip makes autoBoxSize measure what draw.io draws: <br> is a line, other inline tags are invisible. Graphviz (HTML-like table labels), D2 (grid containers + markdown-in-shape) and TeX (box+glue) converged on exactly this design: nested boxes for block structure, proportional glue, a small inline set for text — never full HTML. Prompts teach the composition with a comparison-card recipe; verified by rebuilding the CoT poster end to end in the real editor.