Sync Decorator to Java 25: H6 file labels, fix Main.java JDK-output mismatch, README mapping

02-structural/decorator/PlainTextProcessor.java

@@ -1,14 +1,12 @@
 package decorator;
-
 /**
- * Concrete Component — the base object being decorated.
- * Does nothing special: just returns the text as-is.
- * All decorators wrap this (or other decorators on top of it).
+ * Concrete Component — the starting point for decoration.
+ * Returns text unchanged. Decorators wrap around this
+ * and transform the result one layer at a time.
  */
 public class PlainTextProcessor implements TextProcessor {
-
     @Override
     public String process(String text) {
-        return text;  // base: no transformation
+        return text;  // no transformation — base case
     }
 }