Status: IN
8% of premises contain fabricated details the source never mentioned (propose-beliefs Phase 2 experiment, 100 randomly sampled premises from handbook-expert). Dominant error type is embellishment, not contradiction — the proposer adds plausible but unsupported specifics (e.g., Redis when source says nothing about storage backend).
Source: repo:beliefs-pi/entries/2026/06/09/propose-beliefs-accuracy-phase2-results.md