Add piecewise cumul costs - #84
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Expose native piecewise cumul costs with Ruby arrays and validate inputs before OR-Tools reaches fatal checks.
erickreutz
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RoutingDimension::SetCumulVarPiecewiseLinearCostis excluded from generated language bindings, which prevents Ruby routing models from expressing progressive cumul costs without callbacks. This exposes it asset_cumul_var_piecewise_linear_costwith Ruby breakpoint and slope arrays.The binding validates shape, ordering, and nonnegative cost before calling native constructors that otherwise use fatal checks. OR-Tools copies the curve into the model, so the solve retains no Ruby objects. The coverage exercises objective behavior, warm solves, copied ownership, disabled behavior, and invalid inputs.