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)

Scenarios/GetScenarioRunRequest.cs

@@ -1,11 +0,0 @@
-// Code generated by apigen. DO NOT EDIT.
-using Newtonsoft.Json;
-
-namespace RudderSdk.Core.Models.Scenarios;
-
-public class GetScenarioRunRequest
-{
-    [JsonProperty("runId")]
-    public string? RunId { get; set; }
-
-}

Scenarios/GetScenarioRunResponse.cs

@@ -1,18 +0,0 @@
-// Code generated by apigen. DO NOT EDIT.
-using Newtonsoft.Json;
-using RudderSdk.Core.Models;
-
-namespace RudderSdk.Core.Models.Scenarios;
-
-public class GetScenarioRunResponse
-{
-    [JsonProperty("plan")]
-    public ExecutionPlan? Plan { get; set; }
-
-    [JsonProperty("runId")]
-    public string? RunId { get; set; }
-
-    [JsonProperty("status")]
-    public string? Status { get; set; }
-
-}

Scenarios/HandleScenarioCallbackResponse.cs

@@ -1,12 +1,12 @@
 // Code generated by apigen. DO NOT EDIT.
 using Newtonsoft.Json;
-using RudderSdk.Core.Models;
+using Newtonsoft.Json.Linq;
 
 namespace RudderSdk.Core.Models.Scenarios;
 
 public class HandleScenarioCallbackResponse
 {
-    [JsonProperty("plan")]
-    public ExecutionPlan? Plan { get; set; }
+    [JsonProperty("effect")]
+    public JToken? Effect { get; set; }
 
 }

Scenarios/ListPendingScenarioEffectsResponse.cs

@@ -0,0 +1,12 @@
+// Code generated by apigen. DO NOT EDIT.
+using Newtonsoft.Json;
+using System.Collections.Generic;
+
+namespace RudderSdk.Core.Models.Scenarios;
+
+public class ListPendingScenarioEffectsResponse
+{
+    [JsonProperty("effects")]
+    public List<PendingEffect> Effects { get; set; } = null!;
+
+}

Scenarios/PendingEffect.cs

@@ -0,0 +1,28 @@
+// Code generated by apigen. DO NOT EDIT.
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using System;
+
+namespace RudderSdk.Core.Models.Scenarios;
+
+public class PendingEffect
+{
+    [JsonProperty("data")]
+    public JToken Data { get; set; } = null!;
+
+    [JsonProperty("nodeId")]
+    public string NodeId { get; set; } = null!;
+
+    [JsonProperty("runId")]
+    public string RunId { get; set; } = null!;
+
+    [JsonProperty("scenarioId")]
+    public string ScenarioId { get; set; } = null!;
+
+    [JsonProperty("type")]
+    public string Type { get; set; } = null!;
+
+    [JsonProperty("waitDeadline")]
+    public DateTimeOffset? WaitDeadline { get; set; }
+
+}

Scenarios/TriggerScenarioResponse.cs

@@ -1,13 +1,12 @@
 // Code generated by apigen. DO NOT EDIT.
 using Newtonsoft.Json;
 using System.Collections.Generic;
-using RudderSdk.Core.Models;
 
 namespace RudderSdk.Core.Models.Scenarios;
 
 public class TriggerScenarioResponse
 {
-    [JsonProperty("plans")]
-    public List<ExecutionPlan>? Plans { get; set; }
+    [JsonProperty("effects")]
+    public List<PendingEffect> Effects { get; set; } = null!;
 
 }

Scenarios/UpdateScenarioCounterResponse.cs

@@ -1,6 +1,6 @@
 // Code generated by apigen. DO NOT EDIT.
 using Newtonsoft.Json;
-using RudderSdk.Core.Models;
+using Newtonsoft.Json.Linq;
 
 namespace RudderSdk.Core.Models.Scenarios;
 
@@ -9,7 +9,7 @@ public class UpdateScenarioCounterResponse
     [JsonProperty("completed")]
     public bool? Completed { get; set; }
 
-    [JsonProperty("plan")]
-    public ExecutionPlan? Plan { get; set; }
+    [JsonProperty("effect")]
+    public JToken? Effect { get; set; }
 
 }