Stage 4: Web3 black market spot counter and Ponero desk

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Decentralized/Session.cs

@@ -26,6 +26,7 @@ namespace Decentralized
         public Wallet Hot = new Wallet { Address = "hot" };
         public Exchange Exchange = new Exchange();
         public Mixer Mixer = new Mixer();
+        public BlackMarket Black = new BlackMarket();
         public List<MarketEvent> ActiveEvents = new List<MarketEvent>();
         public NightReport LastNight;
         public bool OpeningNewsShown;
@@ -70,6 +71,7 @@ namespace Decentralized
         {
             if (asset == Assets.PSC) return Data.Market.Price;
             var spec = Assets.Get(asset);
+            if (asset == Assets.Ponero) return BlackMarket.PoneroPrice(Data.Market.Price);
             if (spec != null && spec.Stable) return Data.Stable.Price(asset);
             return 0;
         }