stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.AuditPack/Services/VerdictReplayPredicate.DivergenceHelpers.cs

@@ -0,0 +1,45 @@
+namespace StellaOps.AuditPack.Services;
+
+public sealed partial class VerdictReplayPredicate
+{
+    private static DivergenceCategory MapDriftTypeToCategory(DriftType driftType)
+    {
+        return driftType switch
+        {
+            DriftType.Decision => DivergenceCategory.Decision,
+            DriftType.VerdictDigest => DivergenceCategory.VerdictHash,
+            DriftType.VerdictField => DivergenceCategory.VerdictField,
+            DriftType.InputDigest => DivergenceCategory.Input,
+            _ => DivergenceCategory.Other
+        };
+    }
+
+    private static string GenerateDivergenceSummary(List<DivergenceItem> divergences)
+    {
+        if (divergences.Count == 0)
+        {
+            return "Replay matched original verdict exactly.";
+        }
+
+        var hasDecisionChange = divergences.Any(d => d.Category == DivergenceCategory.Decision);
+        var hasVerdictChange = divergences.Any(d => d.Category == DivergenceCategory.VerdictHash);
+        var hasInputChange = divergences.Any(d => d.Category == DivergenceCategory.Input);
+
+        if (hasDecisionChange)
+        {
+            return "Replay produced a different policy decision.";
+        }
+
+        if (hasVerdictChange)
+        {
+            return "Replay verdict differs in content but decision is the same.";
+        }
+
+        if (hasInputChange)
+        {
+            return "Input digests differ but verdict is unchanged.";
+        }
+
+        return $"Replay detected {divergences.Count} divergence(s).";
+    }
+}