Facade: split subsystem into one class per file, sync post code blocks to Java 25, add README mapping

02-structural/facade/CodecFactory.java

@@ -0,0 +1,10 @@
+package facade;
+
+/** CodecFactory — inspects a VideoFile and returns the matching Codec. */
+class CodecFactory {
+    static Codec extract(VideoFile file) {
+        System.out.println("  CodecFactory: extracting codec from " + file.getFilename());
+        if ("mpeg4".equals(file.getCodecType())) return new MPEG4CompressionCodec();
+        return new OggCompressionCodec();
+    }
+}