pipe: Q76 -- close beam's median collection and lane-gate item at bfa5902

Q76 CLOSED at bfa5902 and this commit. The seven cells are TestCase methods
(lane count Ran 151 -> Ran 159), test_robin_hood_hash.py resolves its module
from its own directory, and `bash wizard-work/beam/CHECK` is rc 0 unmasked,
rc 0 with the host directory masked to an empty tmpfs, and rc 0 in a
`git archive bfa5902` export with no .git (Ran 159, OK, toposort ALL PASS
242 checks).

Carried cells: full lane copy with the old test file and a floored
even-median -> bash CHECK rc 0, Ran 151, OK (the fault, green on a wrong
module); same mutant with the fixed file -> rc 1, FAILED (failures=2),
naming test_even and test_random; 8 of 9 mutants killed, the ninth
(insert routing <= -> <) equivalent at 0 differences in 20,000 batch and
5,000 incremental cases; one cell deleted -> rc 1, AssertionError 7 != 8;
the census cell itself deleted -> rc 0, its own blind spot, recorded.

Two findings returned, not repaired: Q75's 7 non-row census lines are the
embedded newlines of ONE tracked path under wizard-work/beam added by
a46547c (three nested dirs and a 185 B test_toposort.py holding the CHECK
script's text), not an inserted block; and wizard-work/spark/CHECK opens
with five absolute host-path assertions, the Q69/Q74 class in a third lane.

Record: wizard-work/volt/q76-2026-10-26.md. Queue index re-rendered.

docs/queue-index.md

@@ -75,7 +75,7 @@
 | 65 | Q73 | 11575-11624 | 15286 | opening | sphinx's longctx archive gates its numbers and its claim-scoped quotations, but not its prose numbers, its claim sentences, its README, or the quotations that carry no claim id *(sphinx lane; opened … | open and unclaimed. |
 | 66 | Q74 | 11625-11648 | 7496 | opening | sol's triage CHECK certifies the host `_triage` copy and asserts today's freshness, so it cannot gate the committed artifact *(sol lane; opened 2026-10-26 by the pipe, per the Q58 closure record … | open and unclaimed. |
 | 67 | Q75 | 11649-11662 | 3867 | opening | ledger's two census TSVs carry seven lines that are not rows and one path no file on disk has, and no gate in the lane can see either *(ledger lane; opened 2026-10-26 by the pipe, at `b82b023`)* | open and unclaimed. |
-| 68 | Q76 | 11663-11673 | 4047 | opening | beam's new median tests reach no gate, and the lane gate that would run them is red for a host path older than the commit *(beam lane; opened 2026-10-26 by the pipe, at `c3ce8dd`)* | open and unclaimed. |
+| 68 | Q76 | 11663-11689 | 10822 | opening | beam's new median tests reach no gate, and the lane gate that would run them is red for a host path older than the commit *(beam lane; opened 2026-10-26 by the pipe, at `c3ce8dd`)* | open and unclaimed. |
 
 ## Ids with no `## ` heading
 
@@ -287,9 +287,9 @@ The block below is the parse this document renders, byte for byte. `--check` com
   "end_line": 8,
   "line": 1
  },
- "queue_bytes": 1705017,
- "queue_lines": 11673,
- "queue_sha256": "420f28718bf1b900b9a4673ee0baddbc57d7418afabfc0aa6ac92091a7abf82a",
+ "queue_bytes": 1711792,
+ "queue_lines": 11689,
+ "queue_sha256": "4f8c90f61ab2d873b2062c86fdc1d006651f0914b1415fc468b758e2700f4a9d",
  "sections": [
   {
    "bytes": 3139,
@@ -1096,11 +1096,11 @@ The block below is the parse this document renders, byte for byte. `--check` com
    "title": "ledger's two census TSVs carry seven lines that are not rows and one path no file on disk has, and no gate in the lane can see either *(ledger lane; opened 2026-10-26 by the pipe, at `b82b023`)*"
   },
   {
-   "bytes": 4047,
-   "end_line": 11673,
+   "bytes": 10822,
+   "end_line": 11689,
    "id": "Q76",
    "line": 11663,
-   "lines": 11,
+   "lines": 27,
    "role": "opening",
    "role_detail": "",
    "status": "open and unclaimed.",