fix(cloudflare): handle aborted response body in miniflare worker proxy

[john-royal]

Summary

• Attach an 'error' listener on the Miniflare response body stream so a client disconnect mid-response destroys the Node response instead of crashing the process with an unhandled 'error' event.
• Fixes flaky alchemy dev deaths during aborted fetches (e.g. Playwright navigation/teardown).
• Closes alchemy-run/alchemy#938 (filed against alchemy; fix lands in alchemy-async).

Test plan

• Run alchemy dev with a worker that returns a slow/streaming response
• Abort requests mid-flight (browser nav, Playwright, or the repro from the issue) and confirm the process stays up
• Confirm normal non-aborted responses still complete correctly

// Before: abort mid-response → unhandled AbortError kills alchemy dev
// After: abort mid-response → body error is handled, process keeps running
if (res.body) {
  const body = Readable.fromWeb(res.body);
  body.on("error", () => out.destroy());
  body.pipe(out, { end: true });
}

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commit: 82b4d32

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