v0.18.1

# OMG! GPT-5.1!

This update adds support for gpt-5.1, gpt-5.1-codex, gpt-5.1-codex-mini. Get it now!

### Docs
* 882914dcae7b52302c59c10880a5f66dc0d2923e: docs(readme): add initialize_as (#1438) (@Amolith)
### Other Stuff
* 7af916bfec670b92c6915c938bbc2fda0317b097:  chore: update fantasy & add support for gpt-5.1 (#1439) (@kujtimiihoxha)
---

<details>
<summary>Verifying the artifacts</summary>

First, download the [`checksums.txt` file](https://github.com/charmbracelet/crush/releases/download/v0.18.1/checksums.txt), for example, with `wget`:

```bash
wget 'https://github.com/charmbracelet/crush/releases/download/v0.18.1/checksums.txt'
```

Then, verify it using [`cosign`](https://github.com/sigstore/cosign):

```bash
cosign verify-blob \
  --certificate-identity 'https://github.com/charmbracelet/meta/.github/workflows/goreleaser.yml@refs/heads/main' \
  --certificate-oidc-issuer 'https://token.actions.githubusercontent.com' \
  --cert 'https://github.com/charmbracelet/crush/releases/download/v0.18.1/checksums.txt.pem' \
  --signature 'https://github.com/charmbracelet/crush/releases/download/v0.18.1/checksums.txt.sig' \
  ./checksums.txt
```

If the output is `Verified OK`, you can safely use it to verify the checksums of other artifacts you downloaded from the release using `sha256sum`:

```bash
sha256sum --ignore-missing -c checksums.txt
```

Done! You artifacts are now verified!

</details>

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