// ---------------------------------------------------------------------------// W3C traceparent parsing shared by the worker edge (server.ts), the MCP agent// handler, and the session DO. The header grammar itself is single-sourced in// `@executor-js/cloudflare/mcp/do-headers` beside the producer that stamps the// header; this module only layers the OTel `tracestate` carrier on top for the// consumers that join the span via the OTel API.// --------------------------------------------------------------------------- import { createTraceState } from "@opentelemetry/api";import { parseTraceparentHeader } from "@executor-js/cloudflare/mcp/do-headers"; export type IncomingSpanContext = {  readonly traceId: string;  readonly spanId: string;  readonly traceFlags: number;  readonly traceState?: ReturnType<typeof createTraceState>;}; export const parseTraceparent = (  traceparent: string | null | undefined,  tracestate: string | null | undefined,): IncomingSpanContext | null => {  const parsed = parseTraceparentHeader(traceparent);  if (!parsed) return null;  return {    ...parsed,    ...(tracestate ? { traceState: createTraceState(tracestate) } : {}),  };};