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

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;
+}