v0.51.6

## Changelog
### Other stuff
* ce3d38624e464ced19748d24790fb11dc60983b4: chore(copilot): add grok 4.5 (@andreynering)
* 5d95682ec313f7611df433a5535b2bf6e6ee40c8: chore(openrouter): exclude `:batch` models (@andreynering)
* 6954183322f69a1c514477b716dbf2d99fb37514: chore: auto-update generated files (#478) (@github-actions[bot])

---

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

First, download the [`checksums.txt` file](https://github.com/charmbracelet/catwalk/releases/download/v0.51.6/checksums.txt) and the [`checksums.txt.sigstore.json` file](https://github.com/charmbracelet/catwalk/releases/download/v0.51.6/checksums.txt.sigstore.json) files, for example, with `wget`:

```bash
wget 'https://github.com/charmbracelet/catwalk/releases/download/v0.51.6/checksums.txt'
wget 'https://github.com/charmbracelet/catwalk/releases/download/v0.51.6/checksums.txt.sigstore.json'
```

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' \
  --bundle 'checksums.txt.sigstore.json' \
  ./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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