Add DB decode annotations and preserved declaration metadata

lynglib/src/commonTest/kotlin/net/sergeych/lyng/DeclAnnotationIntrospectionTest.kt

@@ -0,0 +1,68 @@
+/*
+ * 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.
+ *
+ */
+
+package net.sergeych.lyng
+
+import kotlinx.coroutines.test.runTest
+import net.sergeych.lyng.obj.ObjInt
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class DeclAnnotationIntrospectionTest {
+
+    @Test
+    fun classAnnotationQueriesExposeConstructorAndMemberAnnotations() = runTest {
+        val scope = Scope()
+        val result = scope.eval(
+            """
+            val suffix = "!"
+            
+            object Marker
+            
+            class Sample(
+                @Transient @Tag(1, label: "ctor", extra: suffix) val x: Int
+            ) {
+                @Transient @DbDecodeWith(Marker)
+                var y: Int = 10
+            }
+            
+            val ctorAnnotations: ImmutableList<Map<String, Object>> = Sample.getConstructorAnnotations("x")
+            val ctorTag: Map<String, Object> = ctorAnnotations[1]
+            val ctorPositional: ImmutableList<Object> = ctorTag["positional"] as ImmutableList<Object>
+            val ctorNamed: Map<String, Object> = ctorTag["named"] as Map<String, Object>
+            assertEquals(2, ctorAnnotations.size)
+            assertEquals("Transient", ctorAnnotations[0]["name"])
+            assertEquals("Tag", ctorTag["name"])
+            assertEquals(1, ctorPositional[0])
+            assertEquals("ctor", ctorNamed["label"])
+            assertEquals("!", ctorNamed["extra"])
+            
+            val memberAnnotations: ImmutableList<Map<String, Object>> = Sample.getMemberAnnotations("y")
+            val memberDecodeWith: Map<String, Object> = memberAnnotations[1]
+            val memberPositional: ImmutableList<Object> = memberDecodeWith["positional"] as ImmutableList<Object>
+            assertEquals(2, memberAnnotations.size)
+            assertEquals("Transient", memberAnnotations[0]["name"])
+            assertEquals("DbDecodeWith", memberDecodeWith["name"])
+            assertEquals(Marker, memberPositional[0])
+            
+            memberAnnotations.size + ctorAnnotations.size
+            """.trimIndent()
+        ) as ObjInt
+
+        assertEquals(4L, result.value)
+    }
+}