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- overlay translucent: avgAlpha 16.0, maxAlpha 80, green fraction 20% - knobs respond fast: sensitivity 42-71ms, edge offset 18-24ms - auto sheet: slab fraction 0.200, not entire frame marked as slab Playwright tests run against deployed host with ignoreHTTPSErrors. Evidence: test-results/gate-b-2026-09-07-live-verify/ Test suite: frontend/test/bvt/live-mask.spec.ts