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

src/Concelier/__Tests/StellaOps.Concelier.Models.Tests/AffectedVersionRangeExtensionsTests.cs

@@ -71,4 +71,26 @@ public sealed class AffectedVersionRangeExtensionsTests
 
         Assert.Null(rule);
     }
+
+    [Fact]
+    public void ToNormalizedVersionRule_FallsBackForApkRange()
+    {
+        var range = new AffectedVersionRange(
+            rangeKind: "apk",
+            introducedVersion: null,
+            fixedVersion: "3.1.4-r0",
+            lastAffectedVersion: null,
+            rangeExpression: "fixed:3.1.4-r0",
+            provenance: AdvisoryProvenance.Empty,
+            primitives: null);
+
+        var rule = range.ToNormalizedVersionRule("alpine:v3.20/main");
+
+        Assert.NotNull(rule);
+        Assert.Equal(NormalizedVersionSchemes.Apk, rule!.Scheme);
+        Assert.Equal(NormalizedVersionRuleTypes.LessThan, rule.Type);
+        Assert.Equal("3.1.4-r0", rule.Max);
+        Assert.False(rule.MaxInclusive);
+        Assert.Equal("alpine:v3.20/main", rule.Notes);
+    }
 }