core/v1.8.4

## Core Release v1.8.4

- fix: strip the encrypted reasoning signature when the upstream reports the field as unsupported (e.g. Bedrock Converse replaying a Claude signature onto a non-Anthropic model after a mid-conversation model switch), extending the existing unverifiable-signature fail-soft
- fix: clear Anthropic raw-body passthrough based on the resolved provider and model pair, so non-Claude models on multi-family providers (Vertex, Azure, Bedrock Mantle) convert the request instead of passing the Anthropic payload through

### Installation

```bash
go get github.com/maximhq/bifrost/core@v1.8.4
```

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_This release was automatically created from version file: `core/version`_