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export class OperationError extends Error {
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  readonly status: number;
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  constructor(status: number, message: string) {
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    super(message);
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    this.status = status;
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  }
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}
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export function demand(value: unknown, status: number, message: string): asserts value {
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  if (!value) throw new OperationError(status, message);
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}
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/** Expected failures cross the RPC boundary as data, preserving status codes. */
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export type RpcResult<T> = { ok: true; value: T } | { ok: false; status: number; error: string };