- Each AudioOut is logged as audio #N: the open with its guest call site, Start / Stop / Close (first 32 per output), and the 2000-callback stats line per output. An Engage phone log had two outputs after a background round trip, one fed and one starved; the combined stats read as "every other callback underruns"
- DM_OE_SCRIPT gains bg=1 / bg=0, the same sequence as the iOS lifecycle callbacks (focus, audio take-over, guest clock freeze, graphics suspend); DM_AUDIO_MUTE=1 silences the real Core Audio path for such tests on the Mac
- The silent sink no longer makes up time the process was suspended (it pulled seconds' worth at once and logged hundreds of underruns)
- Host tests t_audio, t_audio_spsc and t_oe build again (game profile include, stubs) and pass
- docs/agents/03-bringup.md: several outputs, background round trip on the Mac
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