docs(plan): audio+video separated Visual/Audio controls implementation plan
Session 0020. Anchored on the audio-video-separated-controls Solution Design. Scope: build into the current single-page simulator (simulator-first directive); reframe the unbuilt control-surface spec on paper. 10 tasks, all testing tiers. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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