Path pass over turn-runtime-design.md, session-design.md,
VIDEO_MODE.md, and LIVE_NOTE.md: every source pointer updated to the
runtime/ layout, the turn doc's suggested-module-layout section (§28)
refreshed to the real tree (it predated the event hub, bridges, and
composer), and the session doc's §14 layout fixed including its old
§11/§14 contradiction about where the headless runner lives.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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