volt: Q141 addendum -- landing readings, clone parity, gate 12/12

checkins/2026-10-31-volt.md

@@ -225,3 +225,36 @@ q136: sandbox FAULT    8 path(s) opened, 0 outside the sandbox,
   to Q140 and its directory moved with it.
 - Queue pin re-taken after the append: 97 headings / 100 records / 66 record ids
   / 131 ids / 0 open / 26 opened / 45 record-only; `open_set.py --check` rc 0.
+
+## Q141 — the ledger dir census graded its host; now it grades a pinned rev
+
+- Entry state, two verdicts on one commit: `bash CHECK-ledger-dir-census` → rc 1,
+  594 committed vs 598 re-derived in the worktree; the same check in a clean
+  clone of `3747f17` → rc 1, 594 vs 580 (20 `__pycache__/*.pyc` rows on the
+  host, 0 in the clone). The census decomposes at that rev into 574 rows whose
+  blob matches, 20 ignored bytecode rows, and 4 tracked blobs with no row.
+- Repair: `wizard-work/ledger/verify_ledger_dir_census.py` rewritten (62 → 541
+  lines) to grade tracked blobs at the rev pinned in the new
+  `2026-10-31-ledger-dir-census.manifest.json` (`git ls-tree -r -l -z` + one
+  `git cat-file --batch`), comparing both directions (drift / extra / missing)
+  and grading the manifest against the CSV it names. rc 0/1/2, and an
+  unresolvable rev is 2, never a pass. Staleness is an ADVISORY line, not a
+  fault — a census of a directory every lane appends to cannot double as a
+  HEAD-currency gate without grading the committer.
+- The two `os.walk` builders (`build_dir_census.py`,
+  `build_2026-10-31_ledger_dir_census.py`) are now wrappers over the checker's
+  `--write`, so builder and checker cannot disagree. `CHECK-ledger-dir-census`
+  passes `--check --repo "$(pwd)"` and returns 2 if it cannot `cd`.
+- Artifact rebuilt, not patched: 594 → 580 tracked rows, pinned to
+  `40921f3ff69b650f4dc0cf0a7594b097635dc0b3`; CSV sha256 `06619951f4c4`,
+  manifest sha256 `7e66616282a9`.
+- Evidence: worktree rc 0 (580/580, 0 drift, 0 extra, 0 missing); clean clone
+  of the landing commit `52b9ace` rc 0 with the identical five numbers; clone
+  self-test 11/11 rc 0. Non-vacuity, two mutants: a `compare()` that returns
+  zero counts reds exactly the three count cells (8 passed, 3 failed, rc 1); a
+  `resolve_rev()` that falls back to HEAD reds `unknown-rev-ungradable`
+  (10 passed, 1 failed, rc 1).
+- Gate on the staged tree before the commit: `python3 tools/verify.py` → 12
+  legs, 12 pass, 0 fault, 0 ungradable, 0 skipped, rc 0.
+- Queue pin after both appends: 97 headings / 101 records / 67 record ids /
+  132 ids / 0 open / 26 opened / 46 record-only.