feat(gallery): bring the needle-through-edge ten to the extraction bar

crossNeedle, thermometer, bourdon, stripChart, corrMeter, battCells, mcVu, chromeMinMax, aviationGauge, and edgeMeter each get the contract comment. The six DOM builders take dupre- prefixes across their markup and CSS blocks. Internals go compound where gauge, fader, and nixie already hold the plain names: bourdon's needle, hub, and cap, corrMeter's face, arc, needle, and label, crossNeedle's arc, and thermometer's tube and fill. crossNeedle's nA and nB become dupre-fwd and dupre-rfl, and battCells moves its cell modifiers to the shared dupre-on and dupre-warn.

The handles now enforce their documented domains: the needle meters clamp set() to 0-100, stripChart floors its history at two samples and survives a non-array set(), battCells floors its cell count at one, and mcVu clamps and paints opts.value at build instead of ignoring it for a hard-coded .35. Two probe checks cover the gates and drive the renamed DOM.

Extraction audit: 84/111 contract comments.

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