DHUN test build (auto-replaced on every update)

Rolling UNVERIFIED development build of main. dhun-test.apk = Android, dhun-test.msi = Windows (playback needs a VLC install). Nothing here is stable, signed for stores, or recommended for daily-driver devices. Install only where that is acceptable. Current open checks: docs/verification/03-android-skeleton.md, docs/verification/12-desktop-native.md