recoil example or add to codegen

for recoil example, your code export will need a `chain.ts`

should have this selector in it:

```js
export const cosmWasmClientSelector = selector({
key: 'cosmWasmClient',
get: () => CosmWasmClient.connect(CHAIN_RPC_ENDPOINT),
})
```

Start by locating the Recoil example and the code export path, then check how example files are structured and where chain.ts belongs. Confirm the requested cosmWasmClientSelector shape and make sure the example or codegen output includes it; there are no tests or specific entry points named in the issue.

索引モデルが issue の本文から書いたものです。