MOTO-HUB 0.8.0 Public Preview

Public preview APK for MOTO-HUB 0.8.0 (version code 37). This APK is installable and supports pairing, T-Box streaming, mirroring, diagnostics, and the rest of the public source features. Android Auto is intentionally unavailable because the static private head-unit identity is not included in public releases. A private sideload build is documented in documentation/PUBLIC_RELEASE.md.