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msd-core/.changeset/prohibition-causation-control.md

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type, pr
type pr
Changed 1518

verify-phase test-tier prohibition fail-first can now prove the RED is caused by the violation's content — the node-test machine-proof (#1279) confirmed a known-bad subject drives the negative test RED, but could not tell a genuine content-violation from a deceptive test that reds merely because GSD_PROHIB_SUBJECT is set. An optional fifth flat scalar check_clean_fixture (→ CheckDescriptor.cleanFixture) threads a KNOWN-CLEAN control subject through projectProhibitions + descriptorFromProjection; when present the prover also runs the check against it and requires GREEN, so fail-first is proven only when the check is RED on the violation and GREEN on the clean subject (content-dependent). It is opt-in and additive: absent a clean fixture the prover behaves exactly as it did post-#1314 (no control, documented residual), preserving the zero-authoring compose path; the lint-rule kind needs no analog. (#1346)