data-viz

You describe the data and the words; the renderer applies the brand, computes every value (pivots, totals, steps, bins, changes, ratios, scales) and refuses a chart that would misstate its data.

cd /workspace
V=/workspace/skills/data-viz/scripts/viz.mjs
node $V --spec projects/<slug>/chart.json                   # writes out (PNG) and svgOut if set
node $V --spec projects/<slug>/chart.json --validate-only   # gates and topology only, writes nothing
node $V --list-kinds                                        # every kind and its data fields
node $V --list-transforms                                   # allowlisted transforms and their arguments

Paths resolve under the working directory. Success prints one JSON line: dataset hash and gate verdicts for charts, the topology hash and audit for diagrams, computed values, the palette actually used, and the PNG size. Exit 1 means the spec, a gate or an audit failed: the message says which, so fix the spec. Exit 2 means the tool could not run (toolchain, D2, fontconfig or brand pack missing): report it.