Add Role based grain placement

src/Managing.Application/Bots/Grains/AgentGrain.cs

@@ -3,12 +3,18 @@ using Managing.Application.Abstractions.Grains;
 using Managing.Application.Abstractions.Models;
 using Managing.Application.Abstractions.Services;
 using Managing.Application.Bots.Models;
+using Managing.Application.Orleans;
 using Managing.Domain.Statistics;
 using Microsoft.Extensions.Logging;
 using static Managing.Common.Enums;
 
 namespace Managing.Application.Bots.Grains;
 
+/// <summary>
+/// Orleans grain for Agent operations.
+/// Uses custom trading placement with load balancing and built-in fallback.
+/// </summary>
+[TradingPlacement] // Use custom trading placement with load balancing
 public class AgentGrain : Grain, IAgentGrain
 {
     private readonly IPersistentState<AgentGrainState> _state;