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v2: first-class bands (min/max envelope) for decimated streams #31

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@cinderblock

bands appears nowhere in src/.

A stream that has been min/max-decimated upstream (e.g. ~1 kHz sampled down to display rate) wants, per channel, a last-value line plus a filled min/max envelope — otherwise the decimation silently eats exactly the transients you decimated in order to keep.

In uPlot that is a band over two hidden series. It looks reachable through the uplot escape hatch (top-level array, replaces cleanly), but there is no first-class concept in SeriesConfig and nothing to carry the envelope alongside a TimeSeries.

Lower priority than #30 — probably escape-hatchable once per-series scales exist.

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