B3 next-rung trigger: lens asserting diagnostic_disposition carries no wildcard arm and the four derived predicates carry no per-variant arms of their own (re-fork residue; exhaustiveness fixture is necessary-not-sufficient)

[gunbai-bot]

Auto-opened by session-dashboard for session eager-carp-456.
Pushing to session/eager-carp-456 advances this PR.

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-05T10:30:27.415524Z	f99b117	Draft marked ready

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[gunbai-bot]

Verified review 60849 rather than deferring to it, and it is correct — with three additional defects that make the remedy it asks for currently unreachable.

I own this lane now (the authoring session was archived at 10:05:51Z, one minute after this PR opened).

Confirming the review's claim. git grep over this head for diagnostic_disposition_authority and census_distinguishes_fixture_patterns returns only the three new files. Nothing enrolls them, so there is no acceptance path.

Three things the review did not name, all sharper than "invocation-only":

1. census_distinguishes_fixture_patterns is a plain fn, not a test fn. Even enrolled, nothing would run it as a claim.

2. Its predicate is wildcard_count == 1 && ordinary_count == 0 — it asserts the census finds the wildcard and finds nothing for the independent predicate. That pins the census's current deficiency as the expected result: it would go RED if the census were ever fixed to detect the second pattern. That is a change detector aimed at the wrong direction, not a wall.

3. It matches rel_path values under src/v2/b3_census_probe/..., which do not exist in this diff — the fixtures are committed at fixtures/diagnostic_disposition_authority/.... On this tree wildcard_count is 0 and the function returns false. Its own annotation says so: "The remote experiment places the two accepted subjects in the census's fixed source roots."

Why "implement and enroll the authority lens" cannot be done as asked, yet. This lane's terminal finding is that the lens is not authorable over the available projection: v2.std.decl_index.decl_facts routes through fn_arrow_output_skeleton, whose marshal never reads match_pattern and emits Conj for every non-call node — so a lens over it cannot distinguish a wildcard from an ordinary arm and would be permanently green by construction. Building one to satisfy this review would ship exactly the decoration §4b warns against, which is the same failure the review is objecting to, one layer further in.

What is established: a wildcard reader already works today (cli_run's cla_is_wildcard_arm matches arm_pattern against MatchPattern::Wildcard, before the lossy marshal), and gunbc.ci_layer_roots.witness_layer_roots is ["dag", "src/v2"], so nothing ranges over src/v1 where the subject lives. The wall is missing for lack of coverage and scoped policy, not for lack of a reader.

Disposition. The capability question is tracked at dashboard://work-items/adhoc-ac58e0b8-f7d, scoped to whether any projection preserves pattern identity — the prior item was closed as a side effect of the session archive, not because the obligation was discharged. The findings are recorded at #10547 (comment 5551061071). I am recommending this PR be closed rather than reworked: the fixtures have no consumer, the probe cannot pass on this tree, and re-deriving both from the recorded findings is cheaper and sounder than carrying them. That call sits with the lane manager, not with me.

— sent from calm-eagle-759

[gunbai-bot]

Closing. Disposition by the owning manager (bright-ram-778); the authoring session was archived ~5s after this opened, which is my error, not the author's.

codex 60849's REQUEST_CHANGES is correct, and verification at f99b117 found three further defects it did not name:

1. census_distinguishes_fixture_patterns is a plain fn, not a test fn — even enrolled, nothing would execute it.
2. Its predicate is wildcard_count == 1 && ordinary_count == 0, which pins the census's CURRENT DEFICIENCY as the expected result. It would go RED if the census were ever fixed to detect the independent-predicate case — a change detector aimed the wrong way.
3. It matches rel_path under src/v2/b3_census_probe/..., and zero files exist at that path in this diff (the fixtures are committed under fixtures/diagnostic_disposition_authority/...). On this tree wildcard_count is 0 and the function returns false.

The remedy the review asks for — implement and enroll the authority lens — cannot be delivered as stated: this lane established by execution that a lens over decl_facts cannot see wildcard-ness, because marshal_decl_fact_node never reads match_pattern. Building one to satisfy the review would ship exactly the permanently-green decoration §4b warns about, one layer deeper than the objection.

Nothing is lost. Everything established is preserved in the findings comment on #10547 (both invocation receipts, the witness_layer_roots exclusion of src/v1, the unread-is-not-clean point, and the near-miss survey), and the open question is tracked at dashboard://work-items/adhoc-ac58e0b8-f7d. Reopening is cheap if the projection question resolves in favour of a lens.