Add support for closed classes and enhancements to the Kotlin reflection bridge

lynglib/src/commonTest/kotlin/ClosedClassTest.kt

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+
+import kotlinx.coroutines.test.runTest
+import net.sergeych.lyng.Script
+import net.sergeych.lyng.ScriptError
+import kotlin.test.Test
+import kotlin.test.assertFailsWith
+
+class ClosedClassTest {
+    @Test
+    fun testClosedClass() = runTest {
+        val scope = Script.newScope()
+        scope.eval("""
+            closed class MyClosedClass {
+                fun foo() = 42
+            }
+        """.trimIndent())
+        
+        assertFailsWith<ScriptError> {
+            scope.eval("""
+                class SubClass : MyClosedClass()
+            """.trimIndent())
+        }
+    }
+
+    @Test
+    fun testStdlibClosedClasses() = runTest {
+        val scope = Script.newScope()
+        
+        assertFailsWith<ScriptError> {
+            scope.eval("class MyInt : Int()")
+        }
+        assertFailsWith<ScriptError> {
+            scope.eval("class MyReal : Real()")
+        }
+        assertFailsWith<ScriptError> {
+            scope.eval("class MyString : String()")
+        }
+        assertFailsWith<ScriptError> {
+            scope.eval("class MyBool : Bool()")
+        }
+    }
+}