Summary

• remove the unused requestBody parameter from WorkflowHttpTriggerProcessor.ExecuteWorkflowAsync and the associated route handler so the class no longer carries dead code
• update the HTTP listener registration to use a discard parameter and add focused XML documentation so the method's orchestration responsibilities are clear and consistent with existing style

Testing

• dotnet test FlowSynx.sln (fails: installed SDK 8.0.415 cannot target net9.0; a newer .NET SDK is required)

Closes #704.