Status: IN
Derive over-generates (produces beliefs that don't survive review) and review over-retracts (flags beliefs that could be recovered). Measured: 13-38% retraction rate across 6 infrastructure domains (939 derivations). Working through candidate retractions reveals insights — smuggled premises are usually recoverable (44-59% search-and-link recovery rate).
Source: repo:beliefs-pi/entries/2026/05/29/six-substrate-cross-domain-summary.md