The `IPdfProcessor` interface was added to the `Application/Common/Interfaces/` directory. It includes the `ValidateAsync` method for validating PDFs and extracting metadata, with proper XML documentation and dependency on domain value objects.
Updated `ROADMAP.md` to mark Step 3.1 as completed, detailing the creation of the `IPdfProcessor` interface and its implementation status.
Removed the `<Folder Include="Common\Interfaces\" />` entry from `DocumentOperator.Application.csproj` to reflect the transition from a placeholder folder structure to actual implementation.
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