feat: Implement approvals workflow and notifications integration

- Added approvals orchestration with persistence and workflow scaffolding.
- Integrated notifications insights and staged resume hooks.
- Introduced approval coordinator and policy notification bridge with unit tests.
- Added approval decision API with resume requeue and persisted plan snapshots.
- Documented the Excitor consensus API beta and provided JSON sample payload.
- Created analyzers to flag usage of deprecated merge service APIs.
- Implemented logging for artifact uploads and approval decision service.
- Added tests for PackRunApprovalDecisionService and related components.

src/TaskRunner/StellaOps.TaskRunner/StellaOps.TaskRunner.Tests/FilePackRunStateStoreTests.cs

@@ -1,4 +1,5 @@
-using StellaOps.TaskRunner.Core.Execution;
+using System.Text.Json.Nodes;
+using StellaOps.TaskRunner.Core.Execution;
 using StellaOps.TaskRunner.Core.Planning;
 using StellaOps.TaskRunner.Infrastructure.Execution;
 
@@ -60,12 +61,34 @@ public sealed class FilePackRunStateStoreTests
 
     private static PackRunState CreateState(string runId)
     {
-        var failurePolicy = new TaskPackPlanFailurePolicy(MaxAttempts: 3, BackoffSeconds: 30, ContinueOnError: false);
-        var steps = new Dictionary<string, PackRunStepStateRecord>(StringComparer.Ordinal)
-        {
-            ["step-a"] = new PackRunStepStateRecord(
-                StepId: "step-a",
-                Kind: PackRunStepKind.Run,
+        var failurePolicy = new TaskPackPlanFailurePolicy(MaxAttempts: 3, BackoffSeconds: 30, ContinueOnError: false);
+        var metadata = new TaskPackPlanMetadata("sample", "1.0.0", null, Array.Empty<string>());
+        var parameters = new Dictionary<string, TaskPackPlanParameterValue>(StringComparer.Ordinal);
+        var stepPlan = new TaskPackPlanStep(
+            Id: "step-a",
+            TemplateId: "run/image",
+            Name: "Run step",
+            Type: "run",
+            Enabled: true,
+            Uses: "builtin/run",
+            Parameters: parameters,
+            ApprovalId: null,
+            GateMessage: null,
+            Children: Array.Empty<TaskPackPlanStep>());
+        var plan = new TaskPackPlan(
+            metadata,
+            new Dictionary<string, JsonNode?>(StringComparer.Ordinal),
+            new[] { stepPlan },
+            "hash-123",
+            Array.Empty<TaskPackPlanApproval>(),
+            Array.Empty<TaskPackPlanSecret>(),
+            Array.Empty<TaskPackPlanOutput>(),
+            failurePolicy);
+        var steps = new Dictionary<string, PackRunStepStateRecord>(StringComparer.Ordinal)
+        {
+            ["step-a"] = new PackRunStepStateRecord(
+                StepId: "step-a",
+                Kind: PackRunStepKind.Run,
                 Enabled: true,
                 ContinueOnError: false,
                 MaxParallel: null,
@@ -75,10 +98,11 @@ public sealed class FilePackRunStateStoreTests
                 Attempts: 1,
                 LastTransitionAt: DateTimeOffset.UtcNow,
                 NextAttemptAt: null,
-                StatusReason: null)
-        };
-
-        return PackRunState.Create(runId, "hash-123", failurePolicy, steps, DateTimeOffset.UtcNow);
+                StatusReason: null)
+        };
+
+        var timestamp = DateTimeOffset.UtcNow;
+        return PackRunState.Create(runId, "hash-123", plan, failurePolicy, timestamp, steps, timestamp);
     }
 
     private static string CreateTempDirectory()