v0.3.0-m5 — Launcher + MC-PE HUD

First phone-testable build.

• Launcher screen with device/memory/runtime info; ENTER GAME starts the embedded OpenJDK 21
• MC-PE-style touch HUD: d-pad movement, look-drag spin, jump, 9-slot hotbar recolors the scene
• Guest JVM owns the render loop; survives HOME / surface recreate in the same process

Install: download arm64 APK on your phone, allow install-unknown-apps, launch MobileJava.