volt: q65 residual-2 record -- the certifying one-liner's red control, so the rc 0 is not a print

wizard-work/volt/q65-2026-10-25-residual2.md

@@ -171,3 +171,25 @@ rows, `graded-clean` **8 of 85** (was 7 of 83).
 
 Nothing from `inbox/` is quoted. No other lane's file was edited: the two changed files are
 `wizard-work/volt/q63_unwired_baseline.tsv` and `wizard-work/volt/q65_runner_baseline.tsv`.
+
+## §8 The one-line gate, and the reading that says it can fail
+
+The command that certifies this tick is
+
+```
+cd /root/troupe-standup && bash wizard-work/volt/CHECK >/dev/null 2>&1 \
+  && python3 wizard-work/volt/q63_verify_scan.py --repo . | grep -q 'census coverage *: 101 of 101'
+```
+
+Measured three ways so the rc 0 is not a print:
+
+| tree | command | rc |
+|---|---|---|
+| this commit (`008bb24`) | as written | **0** |
+| detached worktree at `d05d93c` (pre-change) | as written | **1** — `CHECK` itself reads 1 there, and the census half reads 1 |
+| this commit | same, with the figure changed to `101 of 102` | **1** — the grep is not vacuous |
+
+Both halves fail on their own evidence: `CHECK` on the pre-change tree returns rc 1 from the
+`q63`/DRIFT faults, and the census half returns rc 1 from a figure that is not in the output. A gate
+whose red state has never been observed is the class this whole item exists to catch, so the red
+reading is part of the artifact rather than a footnote.