Implement TimeProvider injection for deterministic timestamps across various services and modules

src/__Libraries/StellaOps.Facet/FacetDriftVexWorkflow.cs

@@ -55,6 +55,7 @@ public sealed class FacetDriftVexWorkflow
     private readonly FacetDriftVexEmitter _emitter;
     private readonly IFacetDriftVexDraftStore _draftStore;
     private readonly ILogger<FacetDriftVexWorkflow> _logger;
+    private readonly TimeProvider _timeProvider;
 
     /// <summary>
     /// Initializes a new instance of the <see cref="FacetDriftVexWorkflow"/> class.
@@ -62,11 +63,13 @@ public sealed class FacetDriftVexWorkflow
     public FacetDriftVexWorkflow(
         FacetDriftVexEmitter emitter,
         IFacetDriftVexDraftStore draftStore,
-        ILogger<FacetDriftVexWorkflow>? logger = null)
+        ILogger<FacetDriftVexWorkflow>? logger = null,
+        TimeProvider? timeProvider = null)
     {
         _emitter = emitter ?? throw new ArgumentNullException(nameof(emitter));
         _draftStore = draftStore ?? throw new ArgumentNullException(nameof(draftStore));
         _logger = logger ?? NullLogger<FacetDriftVexWorkflow>.Instance;
+        _timeProvider = timeProvider ?? TimeProvider.System;
     }
 
     /// <summary>
@@ -261,6 +264,6 @@ public sealed class FacetDriftVexWorkflow
     /// </summary>
     public Task<ImmutableArray<FacetDriftVexDraft>> GetOverdueDraftsAsync(CancellationToken ct = default)
     {
-        return _draftStore.GetOverdueAsync(DateTimeOffset.UtcNow, ct);
+        return _draftStore.GetOverdueAsync(_timeProvider.GetUtcNow(), ct);
     }
 }

src/__Libraries/StellaOps.Facet/InMemoryFacetSealStore.cs

@@ -23,6 +23,16 @@ public sealed class InMemoryFacetSealStore : IFacetSealStore
     private readonly ConcurrentDictionary<string, FacetSeal> _sealsByRoot = new();
     private readonly ConcurrentDictionary<string, SortedSet<string>> _rootsByImage = new();
     private readonly object _lock = new();
+    private readonly TimeProvider _timeProvider;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="InMemoryFacetSealStore"/> class.
+    /// </summary>
+    /// <param name="timeProvider">Time provider for deterministic timestamps.</param>
+    public InMemoryFacetSealStore(TimeProvider? timeProvider = null)
+    {
+        _timeProvider = timeProvider ?? TimeProvider.System;
+    }
 
     /// <inheritdoc/>
     public Task<FacetSeal?> GetLatestSealAsync(string imageDigest, CancellationToken ct = default)
@@ -170,7 +180,7 @@ public sealed class InMemoryFacetSealStore : IFacetSealStore
         ct.ThrowIfCancellationRequested();
         ArgumentOutOfRangeException.ThrowIfNegativeOrZero(keepAtLeast);
 
-        var cutoff = DateTimeOffset.UtcNow - retentionPeriod;
+        var cutoff = _timeProvider.GetUtcNow() - retentionPeriod;
         int purged = 0;
 
         lock (_lock)