Why: stages 1-4 needed spec conflicts closed before another review, without treating the agent review as approval.
Evidence: SELF consistency check over NB01-NB24; product tests NOT_RUN.
Impact: proposal text only. Review status stays unreviewed. No business code.
Refs: docs/proposals/2026-10-15-fast-slow-r2-nonblocking.md
Co-authored-by: Cursor <cursoragent@cursor.com>