Why: the plain-base scenario must not run in the phase-3 RDM-combo sweep. Evidence: frontend 986ebdb self-skips unless E2E_PLAIN_BASE=1 (phase-3 rerun showed 4 rdm-audit tests passing); full e2e rerun follows this commit. Impact: modules/frontend pin e058adc -> 986ebdb; e2e.sh phase 4 injects E2E_PLAIN_BASE=1. Refs: 2026-10-12 diagnostic report, increment 2.
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@ bfecf8b51f