+added console spport for lyngio

+added console support to lyng/jlyng CLI
+added unicode escapes
+created tetris console sample

lynglib/src/commonTest/kotlin/UnicodeEscapeTest.kt

@@ -0,0 +1,60 @@
+/*
+ * 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.*
+import net.sergeych.lyng.obj.ObjChar
+import net.sergeych.lyng.obj.ObjString
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFailsWith
+
+class UnicodeEscapeTest {
+    @Test
+    fun parserDecodesUnicodeEscapeInStringLiteral() {
+        val token = parseLyng("\"\\u263A\"".toSource()).first()
+        assertEquals(Token.Type.STRING, token.type)
+        assertEquals("☺", token.value)
+    }
+
+    @Test
+    fun parserDecodesUnicodeEscapeInCharLiteral() {
+        val token = parseLyng("'\\u263A'".toSource()).first()
+        assertEquals(Token.Type.CHAR, token.type)
+        assertEquals("☺", token.value)
+    }
+
+    @Test
+    fun parserRejectsMalformedUnicodeEscapeInStringLiteral() {
+        assertFailsWith<ScriptError> {
+            parseLyng("\"\\u12G4\"".toSource())
+        }
+    }
+
+    @Test
+    fun parserRejectsShortUnicodeEscapeInCharLiteral() {
+        assertFailsWith<ScriptError> {
+            parseLyng("'\\u12'".toSource())
+        }
+    }
+
+    @Test
+    fun evalDecodesUnicodeEscapes() = runTest {
+        assertEquals(ObjString("☺"), eval("\"\\u263A\""))
+        assertEquals(ObjChar('☺'), eval("'\\u263A'"))
+    }
+}