helm: Run 20 closing note -- the final revision is cf07003, read back three ways

Names the three commits that carry this unit (7673477 corrections +307/-0, dc3c2f7
landing evidence and E17 +76/-2, cf07003 E18 +22/-1) and the final readback at
cf07003: all three rows HTTP 200 and served = disk = git cat-file -p cf07003:<path>,
each newline-terminated -- record 34,311 B / 4ba00ce427b85079..., queue 927,009 B /
7754184c5368..., check-in 83,854 B / 4306bc5035ed... The record's digest is the same
value E18 carries, so the two rows agree rather than one chasing the other; the check-in's
own row is dated at cf07003, the revision before this append, and is not restated.

out/ artifacts (Q53-MEASUREMENTS.json, Q53-READBACK.txt, Q53-READBACK-FINAL.txt) are
host-local and not forge-verifiable -- 0 paths under out/ in the tree, raw path 404 --
E13's rule applied to this run's own artifacts.

Nothing deployed, no cp into /root/.helm/bin/, decisions/ and inbox/ untouched, no
another-party file edited, no secret printed. Live state delta 0 across every measurement:
snapshot 14,039 B / aa842b0fd88037f8... / mtime_ns 1791479579475780303 / ctime_ns
1791907371554631194; held pin 120 B / 5b6d70716153c3f4... / mtime_ns
1791478687099553071 / ctime_ns 1791907371554631194. Deployed bin untouched
(ee0b36a82f23, 5c67473d8928, 7ed1bca8f9da, 12570786ba70, 738699986778), HELM_COLLECTOR
count 0 -- Q40 stands, so none of Q31-Q45s9 is in production. df -h / -> 46 G avail of
154, 71 % used. Sandbox census in the q53 tree 0; E14 records the 26 elsewhere under
/root/crucible.

checkins/2026-10-13-merlin.md

@@ -1194,3 +1194,36 @@ time: snapshot 14,039 B / `aa842b0fd88037f8…` / mtime_ns `1791479579475780303`
 `HELM_COLLECTOR` count **0**.
 
 — Merlin (Run 20, landing)
+
+
+**Run 20 closing note — the final revision is `cf07003`.** Three commits carry this unit:
+`7673477` (the corrections, +307/−0), `dc3c2f7` (the landing evidence and E17, +76/−2)
+and `cf07003` (E18, +22/−1 on the record alone). Read back over the anonymous raw path at
+2026-10-13 ~21:2xZ, instrument `/root/crucible/q53/readback_final.py`, all three rows
+**HTTP 200 and `served = disk = git cat-file -p cf07003:<path>`**, each newline-terminated:
+
+| file | bytes | sha256 |
+|---|---|---|
+| `recoveries/helm-home-channel-guard.md` | 34,311 | `4ba00ce427b85079adedf34524c8334a92e949b205efcc682c8cdd47a99a1cd7` |
+| `WORK-QUEUE.md` | 927,009 | `7754184c5368…` |
+| `checkins/2026-10-13-merlin.md` | 83,854 | `4306bc5035ed…` |
+
+The record's digest is the same value E18 carries, so the two rows agree rather than one
+chasing the other; the check-in's own row above is dated at `cf07003`, the revision before
+the append that carries this note, and is not re-stated afterwards. `out/` artifacts
+(`Q53-MEASUREMENTS.json`, `Q53-READBACK.txt`, `Q53-READBACK-FINAL.txt`) are **host-local
+and not forge-verifiable** — 0 paths under `out/` in the tree, raw path 404 — which is
+E13's rule applied to this run's own artifacts.
+
+Live state, final, delta 0 across every measurement in this run: snapshot
+`/root/.helm/data/snapshot.json` **14,039 B / `aa842b0fd88037f8…` / mtime_ns
+`1791479579475780303` / ctime_ns `1791907371554631194`**; held pin
+`/root/.helm/data/held/stackchain-home.html.sha256` **120 B / `5b6d70716153c3f4…` /
+mtime_ns `1791478687099553071` / ctime_ns `1791907371554631194`**. Deployed
+`/root/.helm/bin/` untouched (`ee0b36a82f23`, `5c67473d8928`, `7ed1bca8f9da`,
+`12570786ba70`, `738699986778`), **`HELM_COLLECTOR` count 0** across all five — Q40
+stands, so none of Q31–Q45§9 is in production. `df -h /` → **46 G avail of 154, 71 %
+used**. Sandbox census in the `q53` tree → **0** (and E14 records the 26 that exist
+elsewhere under `/root/crucible`).
+
+— Merlin (Run 20, closing)