research(seprag): BET 2⊗4 filtered-ANN region-pruning — qualified NO-GO (ADR-201) [finding, not a feature]#536

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Commits on Jun 4, 2026

feat(filtered-bench): pre-register BET 2⊗4 + M0 substrate/oracle gate (issue #534)
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feat(filtered-bench): M1 incumbents + post-filter teeth + tuned ACORN baseline
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feat(filtered-bench): M2 contender A — region-pruned IVF (exact B&B)
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feat(filtered-bench): M3 sweep + gate eval — partial WIN (boundary at sel<=1%)
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feat(filtered-bench): M3 adversarial check (contender D) — win largely fails the gate
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docs(adr): ADR-201 — region-pruned filtered ANN vs ACORN, qualified NO-GO (M4)
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docs(adr): ADR-201 next-steps — multi-predicate conjunction hypothesis
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docs(adr): retract conjunction lead in ADR-201 (scrutiny — it doesn't hold)
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