Add Vexer connector suite, format normalizers, and tooling

src/StellaOps.Vexer.Storage.Mongo/VexMongoModels.cs

@@ -570,3 +570,35 @@ internal sealed class VexCacheEntryRecord
             expires);
     }
 }
+
+[BsonIgnoreExtraElements]
+internal sealed class VexConnectorStateDocument
+{
+    [BsonId]
+    public string ConnectorId { get; set; } = default!;
+
+    public DateTime? LastUpdated { get; set; }
+        = null;
+
+    public List<string> DocumentDigests { get; set; } = new();
+
+    public static VexConnectorStateDocument FromRecord(VexConnectorState state)
+        => new()
+        {
+            ConnectorId = state.ConnectorId,
+            LastUpdated = state.LastUpdated?.UtcDateTime,
+            DocumentDigests = state.DocumentDigests.ToList(),
+        };
+
+    public VexConnectorState ToRecord()
+    {
+        var lastUpdated = LastUpdated.HasValue
+            ? new DateTimeOffset(DateTime.SpecifyKind(LastUpdated.Value, DateTimeKind.Utc))
+            : (DateTimeOffset?)null;
+
+        return new VexConnectorState(
+            ConnectorId,
+            lastUpdated,
+            DocumentDigests.ToImmutableArray());
+    }
+}