widen_nets

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Grow the tracks (and optionally vias) of the named nets in place, each as wide as its clearance to every other net's copper, holes and the board edge allows, up to the net's target width. Nothing moves and no via is added, so the score does not change. Routers neck power down to the signal width wherever the class width did not fit their grid; most necks have room around them. List the heaviest current first: earlier nets take the room. Pours are refilled after each net and a widening that leaves the board less connected is backed out. The result names what still holds each remaining neck (a neighbour to move or reroute).