Allow assistants to run in the background (#828)

app/MindWork AI Studio/Tools/AssistantSessions/AssistantSessionKey.cs

@@ -0,0 +1,34 @@
+namespace AIStudio.Tools.AssistantSessions;
+
+/// <summary>
+/// Identifies one logical assistant session slot.
+/// </summary>
+public readonly record struct AssistantSessionKey
+{
+    /// <summary>
+    /// Initializes a new assistant session key.
+    /// </summary>
+    /// <param name="component">The application component the assistant belongs to.</param>
+    /// <param name="instanceId">The assistant-specific instance ID, such as a component type or plugin ID.</param>
+    public AssistantSessionKey(Components component, string instanceId)
+    {
+        this.Component = component;
+        this.InstanceId = instanceId;
+    }
+
+    /// <summary>
+    /// Gets the application component the assistant belongs to.
+    /// </summary>
+    public Components Component { get; init; }
+
+    /// <summary>
+    /// Gets the assistant-specific instance ID, such as a component type or plugin ID.
+    /// </summary>
+    public string InstanceId { get; init; }
+
+    /// <summary>
+    /// Converts the key into a compact diagnostic string.
+    /// </summary>
+    /// <returns>The component and instance ID joined by a colon.</returns>
+    public override string ToString() => $"{this.Component}:{this.InstanceId}";
+}