Fix acquisition pipeline stutter with many channels

Batches per-tick device readings into one signal emit instead of one
per channel, evaluates derived channels once per tick instead of once
per raw sample, and makes ChannelBuffer.window() cost scale with the
window size instead of total buffer history. Strip chart X-range now
scrolls on an independent ~30fps timer instead of only snapping when
new data lands, which was the main visible cause of the stutter.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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