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- audio_formats.py: EA SNR (EA-XMA) stream scanner with block-chain validation, SPLC bank streams and patch tree (records, layers, containers; verified on all 20 banks), .grain files (speed-sweep recordings), loopable speed bands, gain-free 5->2 downmix. - audio_export.py: decodes only what the engine plays (22 ambience beds, 14 grains x 6 speed bands, wheel spins, 23 sample banks) to PCM16 WAV in assets/private/audio with audio_manifest.json (v3, incl. SPLC patch trees). Decoder: pinned vgmstream r2117 (SHA-256 checked) via the existing dependency() helper. - Registered as optional asset group `audio` (versions, receipts, asset_exports, install); a failure records audio-availability.json and the game runs silent. Other groups' fingerprints unchanged. - .gitignore: retail audio extensions and *.wav (Skyline mod WAVs excepted). Tests updated for the new group.