Added echo to output data wthout a newline. (0.36.2)

examples/echo_example.fun

@@ -0,0 +1,23 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2025 Johannes Findeisen
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2025-12-10
+ */
+
+// echo_example.fun
+// Demonstrates echo(expr) which prints without a trailing newline.
+
+// Build a line without newline using echo, then finish with print to add newline
+echo("Hello, ")
+echo("world")
+print("!")
+
+// Expected output:
+// Hello, world!

src/vm/echo.c

@@ -0,0 +1,12 @@
+/**
+ * Implements OP_ECHO: print top-of-stack value without trailing newline.
+ * Does not store into VM output buffer; writes directly to stdout and flushes.
+ */
+
+case OP_ECHO: {
+    Value v = pop_value(vm);
+    print_value(&v);
+    fflush(stdout);
+    free_value(v);
+    break;
+}