Prices each closed round-trip against the nearest quote_snapshots NBBO: per-trade spread cost, book-walk flag (order size > displayed ask), and a cost-adjusted P&L total. Measured this week: 0.3-0.5% median spreads on gate-passing names, ~12% profit drag — far below the static 2-4% microcap proxy. Coverage gaps (quote recorder only follows tracked names) reported per-trade, not silently dropped. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>