feat(gallery): bring the DIP-through-multiband ten to the extraction bar

dipBank, jogWheel, vernierDial, batToggle, flutedKnob, filterBank, chickenHead, slotFader, spadeKnob, and multiBandDial each get the contract comment. The two DOM builders also get dupre- prefixes on their classes (dip/dipsw and the on modifier, jog/shuttle/inner/dimple). jogWheel caches its inner disc instead of querying it on every move.

set() hardening lands where a handle could wedge: vernierDial and flutedKnob clamp 0-100, filterBank clamps the band index and its initial values, and multiBandDial clamps the band and keeps the current one when set() omits it (a bare set(v) previously threw).

Extraction audit: 44/111 contract comments.

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