* fix: Remove ephemeral cache control from document encoding function
* refactor: Improve document encoding types and add file context for anthropic messages api
- Added AnthropicDocumentBlock interface to define the structure for documents from the Anthropic provider.
- Updated encodeAndFormatDocuments function to utilize the new type and include optional context for filenames.
- Refactored DocumentResult to use a union type for various document formats, improving type safety and clarity.
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