Refactored ReadSingleEnvelopeDocResultQuery to use a parameterless constructor and an Envelope property. Introduced FinalizeDocumentController with a GET endpoint to finalize and return envelope documents as PDFs, supporting force regeneration. Added dependency injection for IMediator and FinalizeDocumentJob. Includes a TODO to migrate forceRegenerate logic into the job.
Introduced ReadSingleEnvelopeDocResultQuery and its handler to fetch an envelope's document as a byte array via MediatR. Throws NotFoundException if the document is missing. Includes XML documentation for clarity.
