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- docs/download_audio.py: freesound batch downloader with all 22 confirmed IDs (API key removed — fill in locally from freesound.org) - docs/credits-audio.md: generated CC-BY attribution table - docs/superpowers/plans+specs: sprint 15, 21, 22 implementation plan/spec docs - .claude/settings.json: enable experimental agent teams env var Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>