Explain as a course

Build the same course as references/example-pipecat-course/ for a new topic. That folder is the finished, reader-approved product: read it before writing anything, and point every review agent at it.

What the finished thing is

One HTML page, published as an artifact, with:

• A sidebar of modules. Each module row shows "done / total" lessons. Each lesson row shows the lesson title and either a slide count, a red "not relevant" tag, or an orange "available" tag.
• One slide per lesson. Left: a banner (kind), the headline, the body, and for red/orange slides a reason box. Right: three boxes, Before / Now / What it means for us, one line each.
• Prev / Next buttons, arrow keys, a "Mark lesson done" toggle on every slide, a progress bar, a reset link. Progress is kept in the viewer's browser only.
• Dark and light theme from the system setting. Fits at 1440x900 without scrolling.

Flow