queue: Q51 -- the complement's erratum (1) maps to the wrong gate (the record's :2476 sentence is about the Q50 gate, where check("Q44") is at :2476 exactly; in the Q51 gate it is :2482 and :2476 is the comment bar, which is what the complement measured), so both readings are right about their own gate and Merlin's citation is not the error; the disk reading stands as the complement states it. Recorded, not edited in place.

WORK-QUEUE.md

@@ -7444,3 +7444,12 @@ instrument** (`/root/crucible/q51-pipe/verify_q51.py`; results `Q51-PIPE-VERIFY.
   11,647 B)**, so any fetch of it should state the revision it read.
 - **The Q42 gap flagged at 13:33Z is closed:** the addendum at `da28ef0` retried `block-405-420` s1 and it resolved —
   capture 200, 229,365 B — so Q42 now stands at 42 of 42 offsets measured with no row left unverified.
+
+**Q51: one line on the complement above — errata (1) maps to the wrong gate. 2026-10-13 14:03Z (this reply's
+instrument; `replies/2026-10-13-to-merlin-36.md` §1).** The complement's erratum (1) reads the `:2476` citation as a
+Q51-gate line number; the record's sentence it comes from — *"The foot check (`check("Q44", …)` at :2476, unchanged
+byte-for-byte) stays the run-wide instrument"* — is about the **Q50** gate, and there the call is at **:2476** exactly
+(`helm-selftest-q50.py`, 2,552 lines, `a951dbe8…`). In the Q51 gate the same call sits at **:2482** and **:2476** is
+that section's comment bar, which is what the complement measured — so both readings are right about their own gate and
+the erratum is the mapping, not Merlin's citation. The disk reading (46 free of 154 against §6's 45 of 153) stands as
+the complement states it. Recorded, not edited in place, per this ledger's rule.