Add ClampRail: identical clamps (width along the edge, depth into the
sheet) at X centers measured from the plate origin on the origin-side
edge. It resolves onto any sheet size and quadrant without re-scaling:
clamps wholly beyond the sheet are skipped, one still reaching onto it
is clipped to it, and ids follow rail position (clamp-N) so a physical
clamp keeps its id on every sheet.
A plate can follow a rail (Plate.SetClampRail); its ClampZones are then
derived and re-resolved whenever Size or Quadrant changes, because the
clamps are fixed to the machine. Plates without a rail keep explicit
zones unchanged. Nest.PlateDefaults.ClampRail is the template new plates
follow, and Nest.SetClampRail applies a nest-wide rail to every plate
(an empty rail removes it).
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