Adding support for events & shared state in durable workflows.

dotnet/src/Microsoft.Agents.AI.DurableTask/Workflows/DurableWorkflowCustomStatus.cs

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+// Copyright (c) Microsoft. All rights reserved.
+
+namespace Microsoft.Agents.AI.DurableTask.Workflows;
+
+/// <summary>
+/// Represents the custom status written by the orchestration for streaming consumption.
+/// </summary>
+/// <remarks>
+/// The Durable Task framework exposes <c>SerializedCustomStatus</c> on orchestration metadata,
+/// which is the only orchestration state readable by external clients while the orchestration
+/// is still running. The orchestrator writes this object via <c>SetCustomStatus</c> after each
+/// superstep so that <see cref="DurableStreamingWorkflowRun"/> can poll for new events.
+/// On orchestration completion the framework clears custom status, so events are also
+/// embedded in the output via <see cref="DurableWorkflowResult"/>.
+/// </remarks>
+internal sealed class DurableWorkflowCustomStatus
+{
+    /// <summary>
+    /// Gets or sets the serialized workflow events emitted so far.
+    /// </summary>
+    public List<string> Events { get; set; } = [];
+}