`testing.mutation-claims-are-executed` was the right rule scoped to its first
site: `mutation_manifest.py` declared itself "one per `MUTATION`-graded row of
`docs/guard-inventory.md`", so the same claim written in a code comment, a test
docstring or a decision record was outside it by construction. That is where all
four of ersatztv#812's consecutive review-round defects lived.
Extend the rule in place rather than adding a sibling record: a sibling would
recreate the exact shape (a rule per site class, with the next site class outside
both) that #773, #784 and #743 each are. The subject is unchanged; only the
population widens.
Mechanism: `CLAIMS` in `scripts/tests/mutation_manifest.py`, keyed on the PROSE.
Each entry carries the tracked `site` and the verbatim `quote`, checked every run,
so a reworded sentence reports as a retarget instead of drifting from the entry
that justifies it — this is proposal 2 (a quotation of another file is a claim
about that file) adopted where the referent is declared. Each entry also declares
RED or GREEN and is executed in the existing sandbox. GREEN is new: 47 of the 128
candidate lines the corpus grep returns at efadbec29 assert that a mutation is NOT
noticed, and no `MUTATION` row can express that, so the rule was unsatisfiable for
them. The green direction is read by two separate clauses (exited 0, and something
actually passed) so neither can mask the other, and each carries its own disarm
proof.
Proposal 3 (never anchor prose to a state your own commit moves) is rejected as a
DETECTOR and kept as a phrasing rule: measured 2026-09-04, the only plausible
pattern set for it matched 16 lines across the scanned corpus and every one was
legitimate rationale prose.
The seed set falsified a shipped claim on its first run: `post-review-verdict.sh`
asserted that disarming its array-TYPE read-back test left the suite green. It
does not — jq refuses to iterate a `null` `.statuses` and the script dies with the
parse message, reddening `test_a_readback_whose_statuses_array_is_NULL_is_refused`.
Comment corrected, entry graded RED.
fixes#881
Decisions-Edit: yes
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015QqCpYFsKgnAnx6jVwrKiV
timothyandClaude Fable 5.1
1fc24e8cf6