Base: BD-J Adjustments Blu-ray scaffold

Vendored BD-J SDK, tsMuxeR + local VLC plugins, ffmpeg asset generation,
and a signed BD-J Xlet menu (org.homebrew.MyXlet) authored into a UDF 2.50 ISO.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/org/homebrew/MyXlet.java

@@ -0,0 +1,64 @@
+package org.homebrew;
+
+import java.awt.BorderLayout;
+import javax.tv.xlet.Xlet;
+import javax.tv.xlet.XletContext;
+import javax.tv.xlet.XletStateChangeException;
+import org.havi.ui.HScene;
+import org.havi.ui.HSceneFactory;
+
+public class MyXlet extends Thread implements Xlet {
+    private HScene scene;
+    private AdjustmentsMenu menu;
+    private boolean running;
+
+    public void initXlet(XletContext context) throws XletStateChangeException {
+        menu = new AdjustmentsMenu();
+        menu.setSize(1280, 720);
+
+        scene = HSceneFactory.getInstance().getDefaultHScene();
+        scene.add(menu, BorderLayout.CENTER);
+        scene.addKeyListener(menu);
+        scene.validate();
+        scene.repaint();
+    }
+
+    public void startXlet() throws XletStateChangeException {
+        running = true;
+        menu.setVisible(true);
+        scene.setVisible(true);
+        menu.requestFocus();
+        scene.requestFocus();
+        start();
+    }
+
+    public void pauseXlet() {
+        if (menu != null) {
+            menu.setVisible(false);
+        }
+    }
+
+    public void destroyXlet(boolean unconditional) {
+        running = false;
+        interrupt();
+
+        if (scene != null && menu != null) {
+            menu.setVisible(false);
+            scene.remove(menu);
+        }
+
+        scene = null;
+        menu = null;
+    }
+
+    public void run() {
+        while (running) {
+            try {
+                Thread.sleep(1000);
+            } catch (InterruptedException e) {
+                running = false;
+            }
+        }
+    }
+}
+