Server-side scenario execution: effects client replaces local engine

- client.Effects: typed effects + completion methods posting scenario callbacks
- client.Scenario reduced to TriggerAsync
- pending polling via Update() pump: 30s heartbeat + wait-deadline checks
- local engine, plan persistence (IPlanStateStore) and resume removed
- RealtimeService and realtime transports removed (relay never deployed)
- dead IPlanScheduler leftover removed
- models regenerated from openapi (ExecutionPlan/BoundaryNode gone, PendingEffect added)

RudderClient.cs

@@ -47,11 +47,11 @@ public sealed class RudderClient
     /// <summary>Global quests.</summary>
     public QuestsService Quests { get; }
 
-    /// <summary>Scenario runtime: triggers, node sessions, persistence.</summary>
+    /// <summary>Scenario trigger. Execution lives on the server.</summary>
     public ScenarioService Scenario { get; }
 
-    /// <summary>Realtime websocket channel.</summary>
-    public RealtimeService Realtime { get; }
+    /// <summary>Pending scenario effects: subscriptions and completion callbacks.</summary>
+    public EffectsService Effects { get; }
 
     internal RudderClientOptions Options { get; }
     internal IRudderTransport Transport => Options.Transport!;
@@ -61,10 +61,7 @@ public sealed class RudderClient
     /// <summary>Project key from <see cref="RudderClientOptions.ProjectKey"/>.</summary>
     public string ProjectKey => Options.ProjectKey!;
 
-    /// <summary>Realtime URL from <see cref="RudderClientOptions.RealtimeUrl"/>.</summary>
-    public string? RealtimeUrl => Options.RealtimeUrl;
-
-    /// <summary>Time source used by the scenario runtime.</summary>
+    /// <summary>Time source used by the effects client.</summary>
     public IClock Clock => Options.Clock ?? SystemClock.Instance;
 
     /// <summary>
@@ -90,17 +87,16 @@ public sealed class RudderClient
         Stores = new StoresService(this);
         Leaderboards = new LeaderboardsService(this);
         Inventory = new InventoryService(this);
-        Scenario = new ScenarioService(this);
         BattlePass = new BattlePassService(this);
         Quests = new QuestsService(this);
-        Realtime = new RealtimeService(this);
+        Effects = new EffectsService(this);
+        Scenario = new ScenarioService(this);
     }
 
     /// <summary>Pumps time-dependent services; call every frame.</summary>
     public void Update(float deltaTime)
     {
-        Scenario.Update(deltaTime);
-        Realtime.Update(deltaTime);
+        Effects.Update(deltaTime);
     }
 
     internal Task<TResponse> SendAsync<TRequest, TResponse>(
@@ -151,7 +147,6 @@ public sealed class RudderClient
         }
         catch (RudderAuthException)
         {
-            // Session rejected — refresh once (single-flight) and retry the call once.
             if (!await RefreshTokensAsync().ConfigureAwait(false))
                 throw;
 
@@ -218,7 +213,6 @@ public sealed class RudderClient
             }
             catch
             {
-                // Transport-level failure during refresh — session is over.
             }
         }