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timothyandClaude Fable 5.1 a7d91bf15a fix(876): sweep session narrative out of hooks, workflows, scripts, tests and code comments; grow the detector to the process corpus
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`docs.no-session-narrative` reaches every durable artifact, but its detector scanned only
`docs/**/*.md` and root markdown, and nothing had ever swept the rest. The issue named four sites
from one grep and called them a floor. Deriving the population instead — a whitespace-joined sweep
over every tracked file outside the detector, for the detector's own phrasings plus the attribution
and review-round class #812 found — gave 453 sites in 108 files at `fb5592971`, and a second pass
for phrasings the first list missed (hyphenated `round-N`, "an earlier version", "the reviewer
proved") added residuals in the same files. Every site was classified with #812's three
dispositions (CUT / SEVER / KEEP with its sub-kind) under the who-benefits test; the per-site
manifests are on the PR. The rejected designs, tested-and-rejected fixtures, measurements and
traps stay; the attribution of who found them and the round in which they were found go.

The detector's population grows to `.claude/`, `.gitea/`, `.husky/` and `scripts/` regardless
of extension, minus the detector and its own test (whose fixtures ARE the phrasings) and minus
`scripts/tests/fixtures/` (test data, including decision-record copies — the same reasoning as
the records' own exemption, and what keeps the record's depth measurement true), and `--all`
lists tracked REGULAR files only — a symlink's content is its target and a gitlink has none. The #812
argument for leaving `docs/superpowers/**` in the population runs the other way here: `--diff`
sees only ADDED lines, and 287 of the 453 sites were under 30 days old — this corpus is where
narrative is being added, so the advisory nudge has reach. Density agrees: 56 line-mode hits over
the 113 regular files the predicate admits, against 9 over 66 docs files before #812. `web/` and C# stay out on the same
measurement (3 of 74 PATTERNS-matching sites, ~4,600 files). The predicate did not grow: PATTERNS
matched 74 of 453 sites, and widening the word list to the attribution class is the treadmill
the withdrawn parity test ran on. The population oracle is restated over segments with the new
arms, the synthetic cross product gains the process heads and non-markdown extensions, a fixture
witnesses that a tracked symlink is neither scanned nor counted, a `.py.bak` axis separates a
by-name exemption from a `startswith` over the same tuple, and eight mutants (drop the process
arm, drop the by-name exemption, exempt by `startswith`, drop or add a prefix, drop the fixtures
exemption, list only markdown, drop the symlink filter, test the mode per row instead of per
path) each
redden it. A pre-existing silent drop in `--diff` goes with it: git tab-terminates a `+++`
filename that contains a space, and the kept tab made `is_scanned_path` refuse the file with no
notice — fixed, with a positive control and its own mutant.

Code is unchanged by construction, measured per file type against `origin/main`: Python modules
are AST-equal with docstrings stripped, except `#` lines inside the embedded fixture programs
(string literals) of three test modules; workflows differ only in `#` lines inside `run:` block
scalars; shell, C#, TypeScript and jq are equal with comment lines stripped. The stated
exceptions: the detector and its test, 26 vitest titles that carried review-round or severity
labels or a reviewer attribution (call sites whose title changed — every changed title line
walked back to its `it(` / `it.each(...)(` anchor, so a `' + '` concatenation counts once), two
registry note strings and the mutation manifest's prose fields. scripts/tests: 1565 passed.
Web: lint, typecheck, 1319 tests green. Closes #876.

Decisions-Edit: yes
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PEcBoFw7ctrf3Nb7R7x7wk
2026-09-03 20:51:39 +02:00
timothy 807ebbd38e fix(648): round 4 — the round-1 fail-open was still reachable, via an over-long number
Round 4 found the round-1 MECHANISM alive in round 3's regex. The pattern guaranteed the
operands were digits but not that they fit `test`'s integer range, so a 23-digit major made
`[ "$major" -lt "$min_major" ]` error with "integer expression expected" — and `set -e`
exempts a failing command in an `if` condition, so the conditional read false and the floor
was never asserted. Exit 0. That is precisely what the empty string did in round 1: same
shape, third occurrence, same predicate.

Bounding the runs with {1,9} was not sufficient on its own. The pattern is unanchored at the
end, so `jq-1.99999999999999999999999` simply matched the first 9 digits of the minor and
compared THAT — a mis-parse that passes the floor rather than an error that skips it. The
trailing `([^0-9]|$)` is what actually closes it.

Second hole: `[[:space:]]` matches NEWLINES, so round 3's "anchor" still scanned the whole
output. `jq\n2.34: cannot load shared library` matched `jq`, crossed the newline as
separator, and parsed 2.34. Now the first line only, with `[[:blank:]]`.

Third: the separator class `[-[:blank:]]{1,4}` could be walked across filler —
`jq -- 2.34 (real jq-1.6)` parsed as 2.34, `jq<TAB><TAB>9.9` as 9.9. It is now one of the two
forms real jq emits: `jq-1.6` or `jq version 1.6` (a blank separator REQUIRES the literal
word `version`).

Verified across a 20-case matrix: every legitimate form still parses to the right numbers
(jq-1.6, jq version 1.6, jq-1.7.1, jq-1.6-dirty, jq-1.10 numerically, jq-1.6 (Debian 1.6-2.1),
jq-v1.6, JQ-1.6, jq-1.6.0, CRLF), and every constructed attack fails closed. Four mutations,
each reddening exactly its own tests. The real jq 1.8.2 on this machine still reports cleanly.

Also: the log line now interpolates the first line, so a multi-line --version cannot split the
single grep-able line the no-arg mode exists to emit.

None of these are reachable from a real jq build. They are recorded and fixed because the
guard's own stated invariant — never assert a floor against something it did not parse — was
still violable three rounds in, and the follow-up PR moves this exact code into the
branch-protection-required check.
2026-07-26 22:21:07 +02:00
timothy 4e094637c6 fix(648): the version parser was fail-OPEN on a jq that cannot start
Round 3, and it found that round 2's fix was a REGRESSION on the case that matters most.

`raw=$(jq --version 2>&1 || true)` did two wrong things at once: folded stderr into the
parse input and discarded the exit status. Combined with a pattern that matched the first
<digits>.<digits> ANYWHERE, a jq broken by a glibc mismatch — which exits 127 and writes
"version `GLIBC_2.34' not found" to stderr — parsed as version 2.34 and PASSED the floor.
The strip-based parse this replaced failed CLOSED there. So the fix for a fail-open bug
introduced a worse fail-open bug, in the one script whose entire purpose is to refuse to
certify a version it did not parse.

Same mechanism, second symptom: an unanchored match let a prefix outrank the real version.
`2026.07.26 jq-1.6` parsed as 2026.07; a leading warning line carrying any number won too.

Now: jq's exit status is captured explicitly (`$?` inside `if ! cmd` is the NEGATED status,
so that needed care too), stderr is kept out of the parse, and the pattern is anchored to
the leading `jq` token. Every legitimate form still parses — `jq-1.6`, `jq version 1.6`,
`jq-1.7.1`, `jq-1.6-dirty`, `jq-1.6 (Debian 1.6-2.1)`, `jq-1.10` (numeric compare, so the
two-digit minor is not read lexically).

The tests could not have caught any of this: the shim always exited 0 and never wrote to
stderr, so every case it could express was clean. It now takes stderr and an exit code, and
the four new cases turn red under the exact mutation.

Also: the drift guard now strips comment lines before matching. A future comment citing
`pulls/$pr/files?limit=100` as an example of what not to do would otherwise have reddened
script-tests — which, per this branch's own correction, blocks merges.

And the record no longer over-corrects: the combined-status read is guarded by
`if [ "$mwcs" != "true" ]`, so a red script-tests blocks the hook-mediated merge path, not
literally every merge.

Decisions-Edit: yes
2026-07-26 22:21:07 +02:00
timothy 5e7623b8d5 fix(648,649): security-review round 2 — close the version-parse hole and the untested caller contract
Two real defects, and three docs claims that were simply wrong.

jq-preflight.sh parsed the version by stripping around the first `-` and `.`, which
assumed the format is exactly `jq-X.Y`. A build printing `jq version 1.6` left major
empty; the sanity check concatenated major+minor into "6", which is non-empty and
all-digits, so it PASSED. The floor comparison then ran `[ "" -lt 1 ]`, which errors —
and `set -e` exempts a failing command in an `if` condition, so the conditional read
false and the script exited 0 having asserted nothing, after printing a plausible
"parsed" line. The silently-untested-axis failure this script exists to eliminate,
reproduced inside the script itself. Now parsed by explicit regex, failing closed with a
diagnosis when there is no <digits>.<digits> match. Also: `--expect` with no value exited
1 with empty output on both streams.

The hook's exit-status check was pinned by nothing: mutating `if files=$(...)` into
`files=$(...) || true; files_complete=yes` left the ENTIRE suite green. It survived only
by redundancy — the script writes stdout once, right before exit 0, so failures also
happen to yield empty stdout and `[ -n "$files" ]` catches it. Safe by accident, which is
the exact criticism this branch levels at the old code. Four tests now pin it, with a
stub that FAILS while emitting a docs-only list (the one case redundancy cannot absorb)
plus a positive control proving the harness can see the difference. Verified: the
mutation now turns exactly those tests red.

Docs corrections. The record claimed the --expect pin was safe because script-tests is
"advisory, not a required check" — false. The merge-consent hook reads the COMBINED
status (ci.advisory-red-blocks-the-merge-gate, #598), so firing the tripwire blocks every
non-docs-only merge until someone re-pins. Kept anyway, for a stated reason, but no
longer described as free. The record also asserted in the present tense that
review-verdict.yml checks out the base ref; it has no checkout step at all, so that is
now a future-tense requirement on the follow-up. And the documented .status allow-list
named GitHub's `removed`, which the code rejects.

The drift-guard regex anchored on `?limit=`, so a re-inlined copy written
`files?page=1&limit=50` would have walked past it.

Decisions-Edit: yes
2026-07-26 22:21:07 +02:00
timothy 2fd798cccf fix(648,649): one shared PR-file enumeration + an explicit jq version contract
#649 — the enforced review-verdict.yml guard had drifted strictly WEAKER than the
advisory merge-consent hook: four rounds of #643 hardening landed on the copy whose
failures produce a human prompt, and never reached the copy that writes the
branch-protection-required review-verdict/h10 status. Its fail-closed behaviour on a
garbage response was also incidental (an empty `n` erroring a bash conditional to
false), not designed.

Extract scripts/pr-changed-files.sh as the single implementation both call. Shared
MECHANISM, not policy: the two docs-only allow-lists differ deliberately and stay
separate. review-verdict.yml now checks out the BASE ref, never the PR head, so a PR
cannot rewrite the gate that judges it.

#648 — baking jq into docker/ci/Dockerfile provably cannot cover the gate that broke:
review-verdict.yml is runs-on:small with no toolchain pin, so it gets the host's jq 1.6
(checked, not assumed). Add scripts/jq-preflight.sh: floor+observable everywhere, and a
--expect tripwire on script-tests only — pinning the required merge check would deadlock
every merge on a jq bump.

Verified by mutation: six guards individually broken, each turning exactly its own test
red, then restored byte-identical.

fixes #648
fixes #649
2026-07-26 22:21:07 +02:00