Delivers option (a) from the #1314 maintainer review: thread a fourth flat
scalar check_violation_fixture through the projection so a prohibition authored
at spec-phase machine-proves fail-first and greens through the deterministic
path alone — zero hand-authoring at verify time.
- src/probe-core.cts: Prohibition gains check_violation_fixture?; projectProhibitions
emits it (both kinds) ONLY for a well-formed descriptor and ONLY when non-empty
(blank/absent -> projects absent -> producer hard-gates, never a partial green).
- src/prohibition-enforcement.cts: descriptorFromProjection reads it back into
violationFixture via the same numeric-coercion-safe scalar() normalizer.
- Tests (RED-first, proven non-vacuous by reverting both src edits): CHK-02(#1346)
projection emit, CHK-08(#1346) read-back, CHK-03(D) example round-trip, the
fast-check round-trip property extended to the 4th scalar (the contract trek-e
blocked #1301 on), and a real-subprocess COMPOSE capstone greening end-to-end
through project -> descriptorFromProjection -> default prover+runner.
- Docs flipped from 'hard-gates until #1346' to 'composes end-to-end': verify-phase.md,
prohibition-probe.md, spec-phase.md authoring, ADR-550 addendum, changeset.
#1346 now tracks only the node-test causation residual.
190 affected-suite tests green; eslint + tsc clean; size baseline regenerated.
56d4a1bf39