zernovtechno/RealityFusion ? reverse-engineered prompt

Build me a Unity app for Android phones, Android 9 or newer, that does a mixed reality style experience on a normal smartphone. I want it to use the phone like a simple headset with stereo view and basic 3DoF head tracking, plus camera based hand tracking so I can interact without a controller. It should feel like a small MR shell, not just a demo, with a browser view inside the experience and a few simple scenes or interactions to show the tracking working.

Please make it so I can open the project, run it in Unity, and export an APK. If there are setup steps for permissions, phone sensors, camera access, or XR settings, handle those in the project so it is as close to ready as possible. If some parts already exist in the repo, wire them up and make the whole thing actually run cleanly. Keep the UI simple and usable on mobile. You can check current docs online if you need to.