Runtime/AgentCore/Memory/IConversationStore.cs

using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace OnDeviceAgent.AgentCore
{
    public interface IConversationStore
    {
        Task AppendAsync(ConversationTurn turn, CancellationToken ct);

        Task<string> BuildSummaryAsync(CancellationToken ct);

        Task CompactNowAsync(CancellationToken ct);

        void ResetSession();
    }

    public sealed class ConversationTurn
    {
        public string TimestampUtc { get; set; }
        public string User { get; set; }
        public string Assistant { get; set; }
        public List<string> Tools { get; set; }
    }
}