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- player/audio.py: pure resolve_visual / resolve_audio_url / resolve_audio (§4/§6) - retire player/content.py (7-way table) + its test - player/controls.py: serial contract content -> visual + audio - player/state.py: Playback carries video:bool + audio_source:str - simulator/app.py: /api/alteration validates visual+audio, returns render.video + server-resolved render.audio.url from altitude_index; NOISE_URL constant - tests reframed; full suite 285 passed, 2 skipped Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>