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

02-structural/facade/BitrateReader.java

@@ -0,0 +1,15 @@
+package facade;
+
+/** BitrateReader — reads the video buffer and converts it between codecs. */
+class BitrateReader {
+    static VideoFile read(VideoFile file, Codec codec) {
+        System.out.println("  BitrateReader: reading " + file.getFilename()
+                + " with codec " + codec.getName());
+        return new VideoFile(file.getFilename());
+    }
+
+    static VideoFile convert(VideoFile buffer, Codec codec) {
+        System.out.println("  BitrateReader: converting to " + codec.getName());
+        return new VideoFile(buffer.getFilename());
+    }
+}