stabilizaiton work - projects rework for maintenanceability and ui livening

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

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+// -----------------------------------------------------------------------------
+// RetentionPolicy.cs
+// Sprint: SPRINT_20260118_017_Evidence_artifact_store_unification
+// Task: AS-002 - Implement S3-backed ArtifactStore
+// Description: Retention policy settings for artifacts
+// -----------------------------------------------------------------------------
+namespace StellaOps.Artifact.Infrastructure;
+
+/// <summary>
+/// Retention policy for artifact types.
+/// Sprint: SPRINT_20260118_017 (AS-002)
+/// </summary>
+public sealed class RetentionPolicy
+{
+    /// <summary>
+    /// Number of days to retain artifacts.
+    /// </summary>
+    public int RetentionDays { get; set; } = 365 * 5;
+
+    /// <summary>
+    /// Whether to delete artifacts after expiry (true) or just mark expired (false).
+    /// </summary>
+    public bool DeleteAfterExpiry { get; set; } = false;
+
+    /// <summary>
+    /// Optional S3 storage class to transition to after specified days.
+    /// </summary>
+    public string? TransitionStorageClass { get; set; }
+
+    /// <summary>
+    /// Days after creation to transition to TransitionStorageClass.
+    /// </summary>
+    public int? TransitionAfterDays { get; set; }
+}