/**
 * The cost-code rule, kept on its own so BOTH sides can use it without dragging a
 * server-only dependency in behind it.
 *
 * The plant register writes `SS02`; a purchase order prints `SS-02`. Stripping
 * non-alphanumerics is the whole job — this is the same code typed two ways, NOT a
 * guess at a machine. `lib/purchase-parser.ts` imports pdfjs and `node:module`, so
 * anything a CLIENT component needs must live here instead.
 */
export function normaliseCostCode(raw: string): string {
  return (raw || "").toUpperCase().replace(/[^A-Z0-9]/g, "");
}