e3cfe8c70c
Closes the one coverage gap from the final review: the spec's 'one async call per session' efficiency claim is now directly verified via the reviewer call count, not just implied. Also drops a stale CarryForward-preview mention from the Review projection in the design spec to match the shipped (cleaner) behaviour. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>