- PDFs are now uploaded to Mistral Files API (POST /v1/files) and
processed via a signed document_url, resolving the 422 error caused
by passing data:application/pdf;base64,... to an image endpoint
- Images (JPEG/PNG/GIF/WEBP/BMP/TIFF) use base64 image_url directly
- Unsupported MIME types raise a clear ValueError
- Magic-byte fallback detects PDFs with no file extension
- Switches from openai chat completions to requests HTTP calls
- Adds helper method _upload_pdf_and_get_document()
- Adds TestMistralOCRProvider with 9 unit tests covering all paths
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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