stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Artifact.Infrastructure/ArtifactMigrationState.cs

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+// -----------------------------------------------------------------------------
+// ArtifactMigrationState.cs
+// Sprint: SPRINT_20260118_017_Evidence_artifact_store_unification
+// Task: AS-006 - Migrate existing evidence to unified store
+// Description: Tracks migration progress state
+// -----------------------------------------------------------------------------
+namespace StellaOps.Artifact.Infrastructure;
+
+internal sealed class ArtifactMigrationState
+{
+    private readonly TimeProvider _timeProvider;
+
+    public ArtifactMigrationState(int totalItems, TimeProvider timeProvider)
+    {
+        ArgumentNullException.ThrowIfNull(timeProvider);
+        _timeProvider = timeProvider;
+        TotalItems = totalItems;
+        StartedAt = _timeProvider.GetUtcNow();
+        LastUpdateAt = StartedAt;
+    }
+
+    public int TotalItems { get; }
+    public int ProcessedItems { get; private set; }
+    public int SuccessCount { get; private set; }
+    public int FailureCount { get; private set; }
+    public int SkippedCount { get; private set; }
+    public DateTimeOffset StartedAt { get; }
+    public DateTimeOffset LastUpdateAt { get; private set; }
+
+    public MigrationProgress Apply(ArtifactMigrationResult result)
+    {
+        ProcessedItems++;
+        if (result.Success && !result.Skipped)
+        {
+            SuccessCount++;
+        }
+        else if (result.Skipped)
+        {
+            SkippedCount++;
+        }
+        else
+        {
+            FailureCount++;
+        }
+
+        LastUpdateAt = _timeProvider.GetUtcNow();
+
+        return new MigrationProgress
+        {
+            TotalItems = TotalItems,
+            ProcessedItems = ProcessedItems,
+            SuccessCount = SuccessCount,
+            FailureCount = FailureCount,
+            SkippedCount = SkippedCount,
+            StartedAt = StartedAt,
+            LastUpdateAt = LastUpdateAt,
+            CurrentItem = result.OriginalPath
+        };
+    }
+}