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Two independent cold reviews (one cross-family) agreed on the top two findings. 1. The #688 fix was defeated by its own complement test. test_main_is_QUIET_about_ drift asserted the drift notice was ABSENT while running main() over the LIVE corpus — whose failure condition is bit-for-bit v4's assertion, in the same blocking job, three functions down. p90 sat exactly on 60, so one over-ceiling record would have reddened it. Replaced with an IFF test that uses ceiling_calibration as its oracle, so it asserts the WIRING rather than the corpus's current state, plus a guard that at least one branch fires. 2. The coarse bound was nearly unfalsifiable. `0 < fraction_over < 1/3` accepted EVERY ceiling from 39 to 229 on the real corpus — including the ceiling of 200 my own docstring offered as the case it catches, because one 230-line record keeps the count nonzero. That claim was simply false and is corrected. The floor is now a FRACTION (2%) and the cap 25%, which rejects 200/229/230 and 20, and accepts roughly 45..150. Headroom measured, not estimated: 37 consecutive over-ceiling additions, against ONE record to break v4. 3. yaml.safe_load raises a bare ValueError, not a YAMLError, on a well-shaped but impossible date (stale-after: 2026-06-31), which escaped as a traceback and killed the validator on any machine with PyYAML. The except is now deliberately broad, with a test. 4. PyYAML returns TYPED mapping keys, so a stray `1: x` made sorted(set|set) raise TypeError. Sorted with key=str. 5. The headroom prose was arithmetically wrong (~42/~40 where the real values are 63/64; each addition moves numerator AND denominator) and the record counts were stale. Corrected against measurement. 6. test_adding_ordinary_records passed identically with its two additions removed. It now asserts the additions were counted, and that they break the v4 property while leaving v5 satisfied — guarded by `if`, never asserted, since whether v4 currently holds is a fact about the live distribution and asserting it would rebuild the ratchet. Also recorded honestly in docs.frontmatter-pyyaml-crosscheck: decisions-guard installs no PyYAML, so in CI the cross-check always skips and script-tests already caught both hazards — the CI delta is close to zero and the real fix is the local loop plus the tool/suite agreement. And the new record was trimmed 64 -> 58 prose lines: at 64 it moved p90 to 64 by itself, i.e. this PR would have reddened the old blocking job. That is now cited in the test as the live demonstration. Verification: 426 scripts/tests pass; ruff at baseline parity (47); validator exits 0; corpus back to p90=60, 18/183 over the ceiling, marks_tail and flags_minority both true. Decisions-Edit: yes Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>