Fix HttpServerRequest.toWeb missing duplex option for streaming bodies

[Copilot]

Node.js 18+ requires duplex: "half" when constructing a Request with a streaming body. HttpServerRequest.toWeb() was missing this option, causing TypeError: RequestInit: duplex option is required when sending a body.

Changes

• Added duplex: "half" to Request constructor when body is present
• Added test coverage for POST request conversion with JSON body

export const toWeb = (self: HttpServerRequest): Request | undefined => {
  // ... early returns omitted
  const body = hasBody(self.method) ? Stream.toReadableStream(self.stream) : undefined
  return new Request(ourl.value, {
    method: self.method,
    body,
    headers: self.headers,
    // @ts-expect-error - duplex is required for streaming bodies in Node 18+
    duplex: body !== undefined ? "half" : undefined
  })
}

Impact
Only affects Node.js environments where we construct a new Request from IncomingMessage. Bun/Deno/web contexts return early with the native Request and are unaffected.

---

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Latest commit: d6a7fbf

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