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The e5 embedder puts every cosine in one narrow band (0.79-0.89), so the absolute query_min_score gate cannot tell a real hit from a made-up question: any value under the band answers everything, any value above it answers nothing. False recall was 5/5. New gate asks whether one note is clearly the best instead: top1 - top2 > delta. New query_min_margin config knob, default 0.008, read off the sweep in the recall harness. The absolute floor stays as a second check. On the recall fixture with e5: answered 72% -> 68%, false recall 5/5 -> 1/5. Vikunja #359 Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CGeSZxh1DCtRxmFVSYVGvJ