fix(template-engine): resolve TemplateEngine-015,016 — cascade-rename nested derived templates, correct composed-script ParentPath

tests/ScadaLink.TemplateEngine.Tests/Flattening/FlatteningServiceTests.cs

@@ -624,4 +624,46 @@ public class FlatteningServiceTests
         var alarm = result.Value.Alarms.First(a => a.CanonicalName == "MainPump.PumpFault");
         Assert.Equal("MainPump.PumpAlarmHandler", alarm.OnTriggerScriptCanonicalName);
     }
+
+    // ── TemplateEngine-016: composed-script ScriptScope.ParentPath ─────────
+
+    [Fact]
+    public void Flatten_NestedComposedScript_ScopeCarriesCorrectParentPath()
+    {
+        // Station composes Pump (level 1); Pump composes Motor (level 2).
+        // The depth-1 script's parent is the root template (ParentPath "");
+        // the depth-2 script's parent is the Pump module (ParentPath "MainPump").
+        var motor = CreateTemplate(3, "Motor");
+        motor.Scripts.Add(new TemplateScript("MonitorMotor", "// m") { Id = 70 });
+
+        var pump = CreateTemplate(2, "Pump");
+        pump.Scripts.Add(new TemplateScript("MonitorPump", "// p") { Id = 71 });
+
+        var station = CreateTemplate(1, "Station");
+
+        var compositions = new Dictionary<int, IReadOnlyList<TemplateComposition>>
+        {
+            [1] = new List<TemplateComposition> { new("MainPump") { ComposedTemplateId = 2 } },
+            [2] = new List<TemplateComposition> { new("DriveMotor") { ComposedTemplateId = 3 } },
+        };
+        var composedChains = new Dictionary<int, IReadOnlyList<Template>>
+        {
+            [2] = [pump], [3] = [motor],
+        };
+
+        var instance = CreateInstance();
+        var result = _sut.Flatten(instance, [station], compositions, composedChains,
+            new Dictionary<int, DataConnection>());
+
+        Assert.True(result.IsSuccess);
+
+        var depth1 = result.Value.Scripts.First(s => s.CanonicalName == "MainPump.MonitorPump");
+        Assert.Equal("MainPump", depth1.Scope.SelfPath);
+        Assert.Equal("", depth1.Scope.ParentPath);
+
+        var depth2 = result.Value.Scripts.First(s => s.CanonicalName == "MainPump.DriveMotor.MonitorMotor");
+        Assert.Equal("MainPump.DriveMotor", depth2.Scope.SelfPath);
+        // Parent module of a depth-2 script is the enclosing Pump module.
+        Assert.Equal("MainPump", depth2.Scope.ParentPath);
+    }
 }