Proxy: sync post code blocks to repo exactly, Java 25, add H6 file labels and README mapping

README.md

@@ -287,6 +287,24 @@ javac 02-structural/flyweight/*.java -d out/flyweight
 java -cp out/flyweight flyweight.Main
 ```
 
+### Proxy (`02-structural/proxy/`)
+
+| Post Section | File(s) |
+|---|---|
+| The Subject Interface | `DatabaseConnection.java` |
+| The Real Subject | `RealDatabaseConnection.java` |
+| Virtual Proxy: Lazy Initialisation | `LazyConnectionProxy.java` |
+| Logging Proxy: Cross-Cutting Concerns | `LoggingProxy.java` |
+| Wiring It Together: Proxy Chaining | `Main.java` |
+
+Note: the "Dynamic Proxy with java.lang.reflect.Proxy" snippet is illustrative only — it is not part of this repository's runnable example.
+
+Run it:
+```bash
+javac 02-structural/proxy/*.java -d out/proxy
+java -cp out/proxy proxy.Main
+```
+
 ## Reference
 
 - *Design Patterns: Elements of Reusable Object-Oriented Software* — Gamma, Helm, Johnson, Vlissides