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/Scheduler/StellaOps.Scheduler.WebService/PolicySimulations/PolicySimulationMetricsProvider.cs

@@ -43,6 +43,7 @@ internal sealed class PolicySimulationMetricsProvider : IPolicySimulationMetrics
     private readonly Histogram<double> _latencyHistogram;
     private readonly object _snapshotLock = new();
     private IReadOnlyDictionary<string, long> _latestQueueSnapshot = new Dictionary<string, long>(StringComparer.Ordinal);
+    private string _latestTenantId = string.Empty;
     private bool _disposed;
 
     public PolicySimulationMetricsProvider(IPolicyRunJobRepository repository, TimeProvider? timeProvider = null)
@@ -86,6 +87,7 @@ internal sealed class PolicySimulationMetricsProvider : IPolicySimulationMetrics
         lock (_snapshotLock)
         {
             _latestQueueSnapshot = queueCounts;
+            _latestTenantId = tenantId;
         }
 
         var sampleSize = 200;
@@ -134,16 +136,21 @@ internal sealed class PolicySimulationMetricsProvider : IPolicySimulationMetrics
     private IEnumerable<Measurement<long>> ObserveQueueDepth()
     {
         IReadOnlyDictionary<string, long> snapshot;
+        string tenantId;
         lock (_snapshotLock)
         {
             snapshot = _latestQueueSnapshot;
+            tenantId = _latestTenantId;
         }
 
+        tenantId = string.IsNullOrWhiteSpace(tenantId) ? "unknown" : tenantId;
+
         foreach (var pair in snapshot)
         {
             yield return new Measurement<long>(
                 pair.Value,
-                new KeyValuePair<string, object?>("status", pair.Key));
+                new KeyValuePair<string, object?>("status", pair.Key),
+                new KeyValuePair<string, object?>("tenantId", tenantId));
         }
     }