40-row CSV with obviously-fake sales data (fictional companies like Acme Corp, Wonka Industries, Cyberdyne Systems). demo.improv generated via headless import with Profit formula and a default view showing Region+Product on rows, Date_Month+Measure on columns. Added the import command to the README quick-start section. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>