Non-git writers (~/Downloads, untitled) won't know to open Source Control.
So: editor title-bar actions (Review Changes / Ask Claude / Toggle
Annotations / Mark Changes as Reviewed) + '✦ Coediting · N changes'
status-bar item (click -> review) + auto-open review on proposals are the
primary entry points; SCM viewlet + gutter become optional git-user extras.
Resolves Q3. Updated INV-13, §5 UX, PUC-1/2, decisions; also removed the
stale open Q8 (resolved by D14).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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