11 CC0 stereo binaural/entrainment candidates (verified on freesound) for
evolving the Music option into a crossfading stress-relief set. Durable record
in docs/binaural-candidate-pool.md; interactive audition gallery at
simulator/static/review_binaural.html (gitignored local-only, like the other
review galleries — streams the CC0 previews, tick-to-keep + copy picks).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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