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W31 self-improvement gap #2 (reviewer-confirmed): 125 GREENs shipped, only 41 ever reviewed. Most grinds are low-risk and fine to skip, but a GREEN that escalated past the floor tier, had a regression along the way, or grew past a minimal-fix size is exactly the kind of result likely to hide a real problem in code nobody looks at again. grind()'s report() now emits a machine-parseable "AUTO-REVIEW: yes (reasons)" marker on those GREENs; serve() parses it and fires the same @reviewer ask a human would send, reusing the existing wake-on-address mechanism (reviewer_lurker/CLAUDE.md) rather than adding a new dispatch path.