Invalid bundle size

Failed to send bundle on holesky testnet with size of 22572.

```sh
info: Bundle size: 22572
error: Error while sending Flashbots bundle: invalid bundle body size {"name":"JsonRpcError: -32000","stack":"JsonRpcError: -32000: invalid bundle body size\n at MevShareClient. (/Users/j/-simulation/node_modules/@flashbots/mev-share-client/src/client.ts:75:19)\n at Generator.next ()\n at fulfilled (/Users/j/Coding/simulation/node_modules/@flashbots/mev-share-client/build/client.js:28:58)\n at processTicksAndRejections (node:internal/process/task_queues:95:5)"}
```

Why is that, when max size is 300'000? Also I am only sending about 50 txs.

Start at node_modules/@flashbots/mev-share-client/src/client.ts:75 and trace how the reported 22572-byte bundle is sent to the Holesky endpoint. Compare that request with the documented 300,000 limit and identify the constraint that produces the error. Done means recording the cause and the correct limit or request shape.

Written by the indexing model from the issue text.