A bare expect(false).toBe(true) after the 90s poll hid WHAT diverged in the
drift-trio S4 same-item races (CI 2026-08-24 ×2, local under 15-worker
contention 2/21). The failure now reports each tab that differs from A and
the first differing model line, so the next divergence self-documents
(memory: s4-value-race-divergence — never re-quarantine without the diff).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AH2iPekUGsEAYnMUD5BmAi
cf28e3be82