Introduced MediatR to the project by adding the `using MediatR;` directive in `DependencyInjection.cs`. Registered pipeline behaviors for the `Signature.Commands.SignCommand` to enforce a structured execution order:
1. AnnotationBehavior: Saves annotations.
2. DocStatusBehavior: Creates document status.
3. HistoryBehavior: Records history.
4. SendSignedMailBehavior: Sends notification email (executes last).
These changes improve the command handling pipeline by ensuring sequential and reliable execution of behaviors.
TekH
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