Iteration 21 — EXPIRY screen S-07 5/5 PASS B-05 TRIGGERED — FIFTH HANDOFF NEXT

In plain words: a perfect score that proves a process point. Two firings ago, the EXPIRY screen went one-for-five — stack-duplicates and frameworks died at the gate. That massacre wrote a precise shopping list ("mechanisms with printed guarantees or genuinely absent machinery only"), the refill shopped against it, and today all five refill entries passed: the adaptive-windowing detector with its theorem-grade false-alarm bounds, the 1954 inspection classic, and three mechanisms the lab's stack simply doesn't have (density-ratio, spectral-subspace, matrix-profile). Three carry honest borderline notes — their guarantees are about estimation, not testing, so hand-built permutation checks travel with them for the lab's real-data gate. The contrast — 1/5 then, 5/5 now — is the campaign's cheapest lesson on the record: harvest against the screen's own bar and the screen stops being a slaughterhouse. EXPIRY now has eleven vetted passers; the fifth handoff batch fires next, after which every substantive boundary except regime-scoping will have delivered to the lab.

 S-06 (iter 19):  scaffold-era cohort, harvested BEFORE the bar existed
                  → 1 PASS / 4 OUT (3 stack-duplicates, 1 framework)
 S-07 (iter 21):  refill cohort, harvested AGAINST the S-06 bar
                  → 5 PASS / 0 OUT
 Lesson (recorded): the screen's kills are the next harvest's specification.