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

src/Policy/__Tests/StellaOps.Policy.Engine.Tests/PolicyRuntimeEvaluationServiceTests.cs

@@ -51,6 +51,7 @@ public sealed class PolicyRuntimeEvaluationServiceTests
         Assert.Equal("pack-1", response.PackId);
         Assert.Equal(1, response.Version);
         Assert.NotNull(response.PolicyDigest);
+        Assert.NotNull(response.Confidence);
         Assert.False(response.Cached);
     }