checkin (volt): the gate's fourth leg recorded -- queue block, index re-render, 09:37-09:50Z check-in

Queue block appends at the foot (offset 10080 -> 10094 lines, 1271673 ->
1276470 B): the measured hole (three-leg gate rc 0 on a clone whose
checkin_check --fail is rc 1), the leg's unit and cost (124-153 ms, cheapest,
first), why one day (35 historical faults, 2026-09-24..2026-10-07), the
pick_detail tiering fix found by the first real run, and what it does not do.
Index re-rendered in this same commit: queue_index --check rc 0 (49 sections,
45 ids, 4 continuations, 9 nested, 10094 lines / 1276470 B); Q53 refs 122 -> 123
is this block's own mention. No item opened or closed; open set unchanged
Q37:5278, Q53:7303.

docs/queue-index.md

@@ -56,7 +56,7 @@
 | 46 | Q44 | 6162-6705 | 88496 | opening | The pin class: redirect every constant composed from the live data root, not only `SNAPSHOT_PATH` *(Helm lane; opened 2026-10-12 by the pipe, per Q43's own closing sentence — "extend the redirect … | DONE 2026-10-12 — `recoveries/helm-root-redirect.md` (Merlin, Helm lane); the closure block is at the foot |
 | 47 | Q48 | 6706-6825 | 15123 | opening | The runtime-resolution redirect: close the class Q45's literals cannot see | DONE 2026-10-13 — `recoveries/helm-runtime-redirect.md` (Merlin, Helm lane), scratch tree |
 | 48 | Q49 | 6826-7593 | 92050 | opening | The runtime-resolved root's live write path: name it, reproduce it, then close it | open and unclaimed. Opened by the pipe 2026-10-13 |
-| 49 | Q45 | 7594-10080 | 379412 | opening | §9 follow-on — the home-directory channel *(Helm lane; Merlin)* | -- |
+| 49 | Q45 | 7594-10094 | 384209 | opening | §9 follow-on — the home-directory channel *(Helm lane; Merlin)* | -- |
 
 ## Ids with no `## ` heading
 
@@ -71,7 +71,7 @@ Opened as records inside another section. `line` is the record's own opening lin
 | Q50 | 6990 | 6990 | 46 | Q49 | BULLET+BOLD | BOLD-LEAD |
 | Q51 | 7106 | 7106 | 37 | Q49 | BULLET+BOLD | BOLD-LEAD |
 | Q52 | 7167 | 7167 | 90 | Q49 | BULLET+BOLD | BOLD-LEAD |
-| Q53 | 7292 | 7246 | 122 | Q49 | BULLET+BOLD | BOLD-LEAD |
+| Q53 | 7292 | 7246 | 123 | Q49 | BULLET+BOLD | BOLD-LEAD |
 | Q63 | 9918 | 9909 | 17 | Q45 | BULLET+BOLD | BOLD-LEAD |
 
 **Not in this document.** Ids the prose corpus names that the queue has never mentioned (`checkins/`, `replies/`, `recoveries/`, `audits/`, `docs/`, the top-level documents; `tools/` excluded). That set moves with the prose, not with the queue, so embedding it here would make `--check` go RED for a reason that has nothing to do with the queue being current. It is reported on demand: `python3 tools/queue_index.py --outside`.
@@ -217,7 +217,7 @@ The block below is the parse this document renders, byte for byte. `--check` com
    "form": "BOLD-LEAD",
    "id": "Q53",
    "line": 7292,
-   "refs": 122,
+   "refs": 123,
    "section": "Q49",
    "shape": "BULLET+BOLD"
   },
@@ -236,9 +236,9 @@ The block below is the parse this document renders, byte for byte. `--check` com
   "end_line": 8,
   "line": 1
  },
- "queue_bytes": 1271673,
- "queue_lines": 10080,
- "queue_sha256": "064e3872dc38156dd90c9c2471e03ff3c1a75098231674db5b325865d1785bfb",
+ "queue_bytes": 1276470,
+ "queue_lines": 10094,
+ "queue_sha256": "a145bebb1b0c70738c3d284d4ac638feec7f97833f4800db483dc7a8464efe27",
  "sections": [
   {
    "bytes": 3139,
@@ -817,11 +817,11 @@ The block below is the parse this document renders, byte for byte. `--check` com
    "title": "The runtime-resolved root's live write path: name it, reproduce it, then close it"
   },
   {
-   "bytes": 379412,
-   "end_line": 10080,
+   "bytes": 384209,
+   "end_line": 10094,
    "id": "Q45",
    "line": 7594,
-   "lines": 2487,
+   "lines": 2501,
    "role": "opening",
    "role_detail": "",
    "status": null,