fix: preserve literal namespace components across evaluation paths

bindings/csharp/Regorus.Tests/RegorusTests.cs

@@ -51,6 +51,34 @@ public void Rule_conflict_preserves_error_status_and_reports_previous_location()
         Assert.IsFalse(ex.Message.Contains('"'));
     }
 
+    [TestMethod]
+    public void Package_metadata_preserves_legacy_projection_while_rule_paths_remain_canonical()
+    {
+        using var engine = new Engine();
+        var package = engine.AddPolicy(
+            "namespace.rego",
+            """
+            package graph.defUniqueName["1.0.0"]
+
+            default deny := false
+            deny := true if { input.blocked == true }
+            """);
+
+        Assert.AreEqual("data.graph.defUniqueName.1.0.0", package);
+        var packageNames = JsonNode.Parse(engine.GetPolicyPackageNames()!);
+        Assert.AreEqual(
+            "graph.defUniqueName.1.0.0",
+            packageNames![0]!["package_name"]!.GetValue<string>());
+        Assert.AreEqual(
+            "namespace.rego",
+            packageNames[0]!["source_file"]!.GetValue<string>());
+
+        engine.SetInputJson("""{"blocked":false}""");
+        Assert.AreEqual(
+            "false",
+            engine.EvalRule("data.graph.defUniqueName[\"1.0.0\"].deny"));
+    }
+
     [TestMethod]
     public void Evaluation_using_file_policies_succeeds()
     {

bindings/csharp/Regorus/Engine.cs

@@ -111,6 +111,12 @@ public void ClearPolicyLengthConfig()
             });
         }
 
+        /// <summary>
+        /// Adds a policy and returns its legacy dot-joined package metadata.
+        /// Quoted string contents omit their delimiter quotes. This value is
+        /// not a canonical rule path; use bracket notation for string
+        /// components when evaluating a rule.
+        /// </summary>
         public string? AddPolicy(string path, string rego)
         {
             return Utf8Marshaller.WithUtf8(path, pathPtr =>
@@ -128,6 +134,11 @@ public void SetRegoV0(bool enable)
             });
         }
 
+        /// <summary>
+        /// Adds a policy file and returns its legacy dot-joined package
+        /// metadata, not a canonical rule path. Quoted string contents omit
+        /// their delimiter quotes.
+        /// </summary>
         public string? AddPolicyFromFile(string path)
         {
             return Utf8Marshaller.WithUtf8(path, pathPtr =>
@@ -261,6 +272,11 @@ public void SetGatherPrints(bool enable)
             });
         }
 
+        /// <summary>
+        /// Returns policy package metadata with its legacy dot-joined text and
+        /// no <c>data</c> prefix. Quoted string contents omit their delimiter
+        /// quotes; use canonical bracketed paths for rule lookup.
+        /// </summary>
         public string? GetPolicyPackageNames()
         {
             return UseHandle(enginePtr =>