Add async StudioMember binding protocol

agents/Aevatar.GAgents.StudioMember/IStudioMemberPlatformBindingCommandPort.cs

@@ -0,0 +1,22 @@
+namespace Aevatar.GAgents.StudioMember;
+
+/// <summary>
+/// Admits and executes platform-side binding work for an admitted StudioMember binding run.
+/// <see cref="StartAsync"/> returns an accepted receipt only. <see cref="ExecuteAsync"/>
+/// starts the platform work and reports completion or failure back to the run actor
+/// through a later continuation event. Callers must only invoke it from a durable
+/// actor state that can re-drive the same command after activation.
+/// </summary>
+public interface IStudioMemberPlatformBindingCommandPort
+{
+    Task<StudioMemberPlatformBindingAccepted> StartAsync(
+        string replyActorId,
+        StudioMemberPlatformBindingStartRequested request,
+        CancellationToken ct = default);
+
+    Task ExecuteAsync(
+        string replyActorId,
+        string platformBindingCommandId,
+        StudioMemberPlatformBindingStartRequested request,
+        CancellationToken ct = default);
+}