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A Light Phone III (Android 14, SDK 34, arm64, Chrome 113 at 424x439) was attached after the PR was opened, so what it listed as unverifiable was checked rather than left as a caveat. SystemOwnsVolume answers true on the device -- the build tag, the constant, the field and the generated binding, end to end, which is the one thing a source sweep only approximates and which nothing else here compiles at all. The control is absent in both mount points on the real engine, and the transport measures 143px, exactly what the desktop-headless "after" predicted. A stored volume of 37 survives a session that demonstrably rewrote the row. The duck is the one that stays open, and now for a stated reason rather than for want of hardware: the foreground service omits setWillPauseWhenDucked from Oreo, so the framework attenuates us itself and never sends AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK -- the device logs `requestAudioFocus() ... flags=0x0` saying so. minSdk is 21, so that path is live code on Android 5.0 to 7.1 and unreachable above it. Asking for a modern phone will not test it.