Build Interactive Vega Visualizations in Verso with PowerShell

[eosfor]

Summary

• explain how PowerShell data preparation and Vega/Vega-Lite specifications fit into Verso notebooks
• walk through four saved visualizations from the Deneb Showcase notebook
• show how the same HTML-producing helpers can target either a standalone report or a rich notebook cell
• document practical notebook structure, saved-output behavior, and Viewer limitations

Validation

• git diff --check upstream/main...HEAD
• npm run build
• npm run validate:articles
• verified all four bundled screenshots and generated article assets
• verified external links, the published prerequisite article route, and the notebook's saved widget count
• parsed the adjacent PowerShell helper scripts without syntax errors

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