Add normalize_audio(): the loudnorm-only pass - #21
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Hoisted from lc40's ffmpeg_helpers: a single EBU R128 loudnorm pass for leveling already-clean takes (batch TTS output), the light-touch cousin of broadcast_audio's full mastering chain. Extension-generic (the old lc40 version hardcoded libmp3lame), in-place via temp + rename.
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Hoisted from lc40 (the *.api-recipe consolidation): a single EBU R128
loudnormpass for leveling already-clean takes — batch TTS output across tracks — as the light-touch cousin ofbroadcast_audio's full mastering chain. Extension-generic where the lc40 original hardcoded libmp3lame; in-place default via temp + rename. Unit dry-run assertions + an at_home in-place normalize of a real sine. Suite green with at_home on.