Android 0.1.0-beta.6

Adds optional shared-relay phone verification, server-origin isolation, and serialized notification registration. Existing direct Firebase delivery remains supported. Version code 8; preserves the existing release signing identity. Bundled MakeReadyOS source: 1c4be8b. The attached generic APK does not include Firebase configuration; native push requires a matching Firebase-enabled publisher/operator build and a configured sender or relay. Relay deployment and physical-device acceptance testing are still required. No sender credentials or deployment configuration are included.