Refactor code structure for improved readability and maintainability; optimize performance in key functions.

src/Scanner/__Libraries/StellaOps.Scanner.SmartDiff/Output/SarifOutputGenerator.cs

@@ -46,7 +46,8 @@ public sealed record SmartDiffSarifInput(
     IReadOnlyList<HardeningRegression> HardeningRegressions,
     IReadOnlyList<VexCandidate> VexCandidates,
     IReadOnlyList<ReachabilityChange> ReachabilityChanges,
-    VcsInfo? VcsInfo = null);
+    VcsInfo? VcsInfo = null,
+    string? DeltaVerdictReference = null);
 
 /// <summary>
 /// VCS information for SARIF provenance.
@@ -244,7 +245,7 @@ public sealed class SarifOutputGenerator
         // Material risk changes
         foreach (var change in input.MaterialChanges)
         {
-            results.Add(CreateMaterialChangeResult(change));
+            results.Add(CreateMaterialChangeResult(change, input.DeltaVerdictReference));
         }
 
         // Hardening regressions
@@ -277,7 +278,7 @@ public sealed class SarifOutputGenerator
         return [.. results];
     }
 
-    private static SarifResult CreateMaterialChangeResult(MaterialRiskChange change)
+    private static SarifResult CreateMaterialChangeResult(MaterialRiskChange change, string? deltaVerdictReference)
     {
         var level = change.Direction == RiskDirection.Increased ? SarifLevel.Warning : SarifLevel.Note;
         var message = $"Material risk change for {change.VulnId} in {change.ComponentPurl}: {change.Reason}";
@@ -288,6 +289,13 @@ public sealed class SarifOutputGenerator
                     ArtifactLocation: new SarifArtifactLocation(Uri: change.FilePath))))
             : (ImmutableArray<SarifLocation>?)null;
 
+        var properties = deltaVerdictReference is null
+            ? null
+            : ImmutableSortedDictionary.CreateRange(StringComparer.Ordinal, new[]
+            {
+                KeyValuePair.Create("deltaVerdictRef", (object)deltaVerdictReference)
+            });
+
         return new SarifResult(
             RuleId: "SDIFF001",
             Level: level,
@@ -297,7 +305,8 @@ public sealed class SarifOutputGenerator
             {
                 KeyValuePair.Create("purl", change.ComponentPurl),
                 KeyValuePair.Create("vulnId", change.VulnId),
-            }));
+            }),
+            Properties: properties);
     }
 
     private static SarifResult CreateHardeningRegressionResult(HardeningRegression regression)