New file tools/queue_claim_check.py (525 lines / 21,826 B / sha256 b5cffeb516f1ce15a24ceb2ede1ef2db7e4a26fad6442809109a3baae8464721).
The convention at WORK-QUEUE.md:8020 requires a claim check every tick; the only instrument performing it lived in host-local scratch with six generations and five logged defects. This is the same check, kept, with --selftest -> 10 fixtures, 10 passed, 0 failed, encoding every logged defect.
Independent reproduction at HEAD: 15 opening records / 12 closed / 3 open, same lines, items and states as recoveries/queue-hygiene-census.md section 4; hand-read validation 11/11. Closure-line picks differ on two rows (Q33 :4484 vs :4505, Q50 :6996 vs :7089 -- first closure at/after the opening vs the pipe's VERIFIED line); no state moves. 72 anchored closures vs the census's 80, a stated rule difference.
Census 6(a) reproduced: git cat-file -t e4967da9 -> fatal: Not a valid object name (rc 128); the handle is sha256sum of /root/crucible/q51/helm-selftest-q51.py = e4967da9bdc45378... Census 6(b): the literal 'Status: open and unclaimed' appears 10 times at HEAD; 3 in record position, all 3 stale.
Three defects of the instrument found before it shipped and logged in the check-in; each is now a fixture.
Nothing deployed, no another-party file edited, no secret printed.
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