App was stuck mid-migration: Bootstrap commented out but markup,
  jQuery, and ix-bootstrap bundle still in place — broken styling
  misrepresented what AXSharp + Operon can do. Rebuilt as a customer
  demo for PLC programmers, fully offline for the hardware rig.

  - replace Bootstrap remnants with Tailwind 4 + Operon components,
    light/dark/system theming via Operon CSS variables
  - consolidate 12 standalone pages into story chapters:
    /rendering, /layouts, /customize, /integrate
  - add landing hero: weather.st declaration beside its live
    rendered control
  - add first PresentationTemplate consumer: SVG gauge template
    for Measurement twin (needle=Acquired, scale=Min/Max,
    color=Result), culture-safe SVG coordinates
  - drop Showdown CDN script; ST snippets render as static
    pre/code panels
  - sync integration-sandbox-showcase spec, archive openspec change