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- Add fade_step parameter to stream_audio for fast volume ramps - _fade_and_cancel helper: smooth ~0.8s fade before track switch - !skip, !stop, !seek now fade out instead of cutting instantly - !prev command: go back to previous track (10-track history stack) - !keep fetches title/artist/duration via yt-dlp, stores in bot.state - !kept displays metadata (title, artist, duration, file size) - !kept clear also removes stored metadata - 29 new tests for fade, prev, history, keep metadata Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>