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feat(lexicon): lexicon v2 schema as a Nickel contract; loader learns relations and evidence (stage 6c PR 1) - #444
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…R, with the false-friend census Propose the next step past per-prover synonyms: a lexicon schema that can record false friends, phrases, specialisations and equivalences with a witness, and an identity-arbitration architecture (λΠ hub for `sound`, consequence-partition probes for `epi`) that maps onto the two ECH-05 fidelity constructors without arbiter or ABI changes. Add scripts/false_friend_scan.sh, a deterministic jq + coreutils census over training_data/proof_states_*.jsonl. On the owner's first stage-6a pair (HOL4 ↔ HOL Light) it finds 5,060 shared theorem names, 1,030 cognate statements and 10,460 differing statement pairs, most of them type generalisations rather than synonyms or contradictions; the within-prover census shows a name is not an identity even inside one corpus. Status: proposed. Owner decisions D1–D5 are listed in the ADR instead of being asked, because the session was ending. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WS4mfQeC3N1DWjcCQJaQqw
…the measured property Review findings on #443 (CodeRabbit), each reproduced before the change: - The final `awk … | head -24` made head close the pipe while awk was still writing; under `set -o pipefail` the finished scan exited 141 (SIGPIPE). awk now stops itself after eight pairs and head is gone. Exit is 0. - `$2 == $3` compared numeric-looking goals numerically (`01` == `1`); both comparisons now force string comparison. - `uniq -d` inherited the caller's locale while `sort` ran under LC_ALL=C; uniq runs under LC_ALL=C too. - The ADR called the 1,030 cognates "byte-identical"; the script compares after whitespace normalisation, so the ADR now says that. - The lexicon v2 `evidence` field: `curated` is provenance only and lifts to `FidelityEvidence::None`; `kernel` needs `checked_by`; only `probe` and a complete `kernel` lift to the arbiter's constructors. The counts are unchanged (95,740/90,170/3,755; 43,937/42,456/1,218; 5,060 shared; 11,490 pairs; 1,030 cognate; 10,460 differing). Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WS4mfQeC3N1DWjcCQJaQqw
…rries independence and injectivity Codex review findings on #443: - The extractor admitted rows with an empty theorem name or an empty goal (three in HOL4, twelve in Why3, more in lambda_prolog), which could join as "cognates" with nothing to compare. Rows whose trimmed name or whitespace-normalised goal is empty are now dropped before the TSV is written. The affected census rows move by a few units (HOL4 95,738 / 90,168; AFP, ACL2, Why3, lambda_prolog likewise); the HOL4 ↔ HOL Light overlap and agreement counts are unchanged. - The ADR claimed the exchange renderings fail safe. They do not: the OpenTheory renderer collapses unsupported terms to one opaque constant and drops binder types, so distinct terms can hash alike. The ADR now says so and requires an injective rendering with unsupported terms rejected before any KernelTranslation is built (decision 5, PR 6). - The ADR claimed no arbiter or ABI change was needed, yet asked for probe independence that DeclaredCorrespondence cannot carry and fidelity_level does not check. It now specifies a standpoint record on DeclaredCorrespondence, an Epi lift only when standpoints differ, and the matching Arbitration.idr argument (option B, decision 3, PR 4), and calls the change what it is: additive. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WS4mfQeC3N1DWjcCQJaQqw
…nto claude/zen-brahmagupta-opqqle # Conflicts: # scripts/false_friend_scan.sh
…relations and evidence Stage 6c, PR 1 of the stack in docs/decisions/2026-10-19-lexicon-v2-and-identity-arbitration.adoc, after the owner's rulings D1 (hub and probe), D2 (Nickel) and D4 (mined candidates flag-only), recorded in the ADR. - data/synonyms/schema.ncl: the schema of record. Nickel imports each TOML table and applies `Table`; the tables stay TOML, so the Rust and Julia loaders are unchanged. It checks shape and the cross-field rules (phrase <=> relation phrase, lossy => residue, evidence shapes, closed field set). - scripts/lexicon-check.sh + tests/lexicon_fixtures/: the gate applies the contract to all 18 shipped tables and to fixtures; 1 accept fixture must pass and 14 planted defects must be rejected. The reject set caught a bug in the first draft (lazy evaluation skipped the evidence check). - rust-ci check job runs the gate with a SHA-256-pinned Nickel release (a run step, so no actions.lock change); `just lexicon-check` runs it locally. - src/rust/suggest/synonyms.rs: Relation, LexiconEvidence (lifts to FidelityEvidence: none/curated -> None, probe -> DeclaredCorrespondence, kernel -> KernelTranslation), FalseFriend, Fidelity, Scope; unknown fields are rejected. alternatives() offers only synonym and phrase rows, so a false friend is never substituted; related() reports the rest, with specialisation and generalisation inverted from the alias side. - fix(data): hol4.toml used the escape \` seven times, which TOML rejects. load_all() therefore failed and `echidna corpus crossquery` crashed on main; it now runs. Found by the contract on its first run. Tests: tests/lexicon_v2_test.rs (7, both load tests failed before the hol4.toml fix), suggest:: unit tests (26), arbitration_fidelity_test (4); clippy -D warnings and rustfmt clean. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WS4mfQeC3N1DWjcCQJaQqw
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Docstring coverage is 70.83% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 24 functions across 4 files. (6 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly identifies the main changes: the Lexicon v2 Nickel schema, loader support for relations and evidence, and the implementation stage. Description check The description is complete and relevant. It includes the summary, key changes, testing evidence, checklist results, known inherited failures, and pending changelog work. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Write docstrings for the functions missing them to satisfy the coverage threshold.
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Review comments at @scripts/lexicon-check.sh:
- Line 39: The reject-fixture loop in the lexicon check must not treat an
unmatched *.toml glob as a valid fixture. Update the loop around the reject
fixture path to expand matching files into an array, explicitly fail when that
array is empty, and iterate over the array otherwise so Nickel validates each
actual reject fixture.
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.github/workflows/rust-ci.ymlJustfiledata/synonyms/README.adocdata/synonyms/hol4.tomldata/synonyms/schema.ncldocs/decisions/2026-10-19-lexicon-v2-and-identity-arbitration.adocscripts/lexicon-check.shsrc/rust/suggest/synonyms.rssrc/rust/suggest/variant.rstests/lexicon_fixtures/accept/v2_all_fields.tomltests/lexicon_fixtures/reject/bad_relation.tomltests/lexicon_fixtures/reject/curated_with_counts.tomltests/lexicon_fixtures/reject/empty_canonical.tomltests/lexicon_fixtures/reject/false_friend_item_shape.tomltests/lexicon_fixtures/reject/false_friend_no_alias.tomltests/lexicon_fixtures/reject/kernel_short_hash.tomltests/lexicon_fixtures/reject/kernel_without_checker.tomltests/lexicon_fixtures/reject/lossy_without_residue.tomltests/lexicon_fixtures/reject/phrase_on_synonym.tomltests/lexicon_fixtures/reject/phrase_without_tokens.tomltests/lexicon_fixtures/reject/probe_more_failures.tomltests/lexicon_fixtures/reject/probe_zero_tests.tomltests/lexicon_fixtures/reject/residue_on_exact.tomltests/lexicon_fixtures/reject/unknown_field.tomltests/lexicon_v2_test.rs
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tests/lexicon_fixtures/accept/v2_all_fields.toml: 1
1-32: LGTM!tests/lexicon_fixtures/reject/bad_relation.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/curated_with_counts.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/empty_canonical.toml: 1
1-5: LGTM!tests/lexicon_fixtures/reject/false_friend_item_shape.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/false_friend_no_alias.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/kernel_short_hash.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/kernel_without_checker.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/lossy_without_residue.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/phrase_on_synonym.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/phrase_without_tokens.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/probe_more_failures.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/probe_zero_tests.toml: 1
1-6: LGTM!tests/lexicon_fixtures/reject/residue_on_exact.toml: 1
1-7: LGTM!tests/lexicon_fixtures/reject/unknown_field.toml: 1
1-6: LGTM!Justfile: 1
1141-1145: LGTM!.github/workflows/rust-ci.yml: 1
80-92: LGTM!data/synonyms/hol4.toml: 1
111-111: LGTM!Also applies to: 131-131, 164-164, 175-175, 233-233, 318-318, 328-328
data/synonyms/schema.ncl: 1
1-157: LGTM!src/rust/suggest/synonyms.rs: 1
12-48: LGTM!Also applies to: 97-165, 190-196, 213-218, 227-229, 244-273, 422-422, 432-432
data/synonyms/README.adoc: 1
71-121: LGTM!docs/decisions/2026-10-19-lexicon-v2-and-identity-arbitration.adoc: 1
5-5: LGTM!Also applies to: 297-310
src/rust/suggest/variant.rs: 1
186-186: LGTM!tests/lexicon_v2_test.rs: 1
1-166: LGTM!
Review finding on #444 (CodeRabbit): with no reject fixtures, Bash passed the unmatched `reject/*.toml` pattern through as a literal path; Nickel failed to load it, and the gate counted that as an expected rejection and exited 0. Reproduced with an empty reject directory (exit 0, "20 files, all as expected"). The three sets are now expanded under nullglob and an empty set fails the gate (exit 1); with the real fixtures it still reports 33 files, all as expected. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WS4mfQeC3N1DWjcCQJaQqw
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…robe counts Addresses the Codex review of #444. - Fidelity lifting is entry-aware. `SynonymEntry::fidelity_evidence` lifts probe/kernel evidence only for an identity claim (a synonym or phrase row that is not lossy); every other row gives `FidelityEvidence::None`. The context-free `LexiconEvidence::to_fidelity` is now private, so a probe on a false friend, specialisation or lossy row can no longer promote an attempt to Epi or Sound. Evidence is kept on those rows: it attests their relation, not identity. - The Julia mirror (`saturation_synonyms.jl`) carries `relation` and `expand_aliases` expands only synonym and phrase rows, matching `Relation::interchangeable`. Untested: no Julia toolchain is reachable from the build environment and no CI job runs this module. - The contract refuses empty alias strings, and probe counts that are not integers in the u32 range; the Rust loader refuses empty names too. Three new reject fixtures; a test checks the loader agrees with the contract on them and that u32::MAX passes both. - Phrase substitution is documented as one-way (alias -> phrase) until phrase-aware site detection exists. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WS4mfQeC3N1DWjcCQJaQqw
8 tasks done
ubuntu-latest is now 26.04, whose apt agda 2.8.0 rejects the options
agda-stdlib v1.7.3 sets ("Unrecognized option: --warn=noUserWarning"),
so the job fails on main and on every PR that touches its path filter.
24.04 ships agda 2.6.3, the version the corpus is verified against.
The lasting fix is moving the stdlib to a 2.8-compatible tag; unpin then.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WS4mfQeC3N1DWjcCQJaQqw
(cherry picked from commit 3716a11)
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## Summary `ubuntu-latest` now resolves to ubuntu-26.04. Its apt `agda` is 2.8.0, which rejects an option that agda-stdlib v1.7.3 sets: `Unrecognized option: --warn=noUserWarning`. As a result the `dogfood-proofs-ci.yml` Agda job fails on `main`, and on every PR that touches its path filter (seen on #444). This PR pins that one job to `ubuntu-24.04`. That image ships agda 2.6.3, the version the corpus is verified against. The other jobs are unchanged. This is a stopgap. The lasting fix is to move the stdlib to a tag that works with Agda 2.8 (and port any proofs that break), then remove the pin. The comment beside `runs-on` says so. ## Changes - `.github/workflows/dogfood-proofs-ci.yml`: the `agda` job uses `runs-on: ubuntu-24.04` instead of `ubuntu-latest`, with a comment explaining why and when to unpin. ## RSR Quality Checklist ### Required - [x] Tests pass: no code changed. The job's own run on this PR is the test. - [x] Code is formatted: n/a (one-line YAML change) - [x] Linter is clean: the file parses as YAML (`Bun.YAML.parse`). actionlint is not installed here, so it was not run. - [x] No banned language patterns - [x] No `unsafe` blocks without `// SAFETY:` comments - [x] No banned functions - [x] SPDX license headers present on all new/modified source files (header unchanged) - [x] No secrets, credentials, or `.env` files included ## Testing - Validated locally that the workflow still parses as YAML. - I have not yet seen this job pass on 24.04. This PR's own CI run of the Agda job is that check, and I'll watch it. --- _Generated by [Claude Code](https://claude.ai/code/session_01WS4mfQeC3N1DWjcCQJaQqw)_ Co-authored-by: Claude <noreply@anthropic.com>
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Summary
PR 1 of the stage-6c stack in
docs/decisions/2026-10-19-lexicon-v2-and-identity-arbitration.adoc(#443), after the owner's rulings recorded in that ADR: D1 hub and probe, D2 Nickel, D4 mined candidates flag-only. D3 and D5 stay open. Pacing ruling: PRs 1 and 3 now; PRs 4–6 (arbiter/ABI changes, kernel translation) wait.Reading of D2 (please correct if wrong): the schema is a Nickel contract applied to the existing TOML tables, which stay the data, so the Rust and Julia loaders are unchanged. Converting the tables themselves to
.nclis left open in the ADR.Also fixes a live bug:
data/synonyms/hol4.tomlwas not valid TOML (\`×7), soload_all()failed andechidna corpus crossquerycrashed onmain. The new contract found it on its first run.Changes
data/synonyms/schema.ncl— schema of record: closed field set,relation(synonym / specialisation / generalisation / false_friend / phrase),phrase,false_friends,evidence(none / curated / probe / kernel),fidelity+residue,scope, with the cross-field rules.scripts/lexicon-check.sh+tests/lexicon_fixtures/— applies the contract to all 18 tables; 1 accept fixture must pass, 14 planted defects must be rejected. The reject set caught a bug in the first draft (Nickel laziness skipped the evidence check)..github/workflows/rust-ci.yml— check job runs the gate with a SHA-256-pinned Nickel 1.12.2 release (arun:step, noactions.lockchange).just lexicon-checkruns it locally.src/rust/suggest/synonyms.rs—Relation,LexiconEvidencewithto_fidelity()(none/curated →None, probe →DeclaredCorrespondence, kernel →KernelTranslation),FalseFriend,Fidelity,Scope; unknown fields rejected;alternatives()offers only synonym/phrase rows so a false friend is never substituted;related()reports the rest, inverting specialisation/generalisation from the alias side;load_path().data/synonyms/hol4.toml— the seven invalid escapes.data/synonyms/README.adoc, the ADR's decision table and status.RSR Quality Checklist
Required
tests/lexicon_v2_test.rs7,suggest::unit 26,arbitration_fidelity_test4)cargo fmt --all -- --check)cargo clippy -p echidna --lib --tests -- -D warnings)unsafeblocks without// SAFETY:comments (none added).envfiles includedAs Applicable
(meta)and/ordocs/decisions/updated — ADR rulings recordeddata/synonyms/README.adocCHANGELOG— not yet; will add if you want it on this PRTesting
tests/lexicon_v2_test.rs: both table-loading tests failed before thehol4.tomlfix and pass after.scripts/lexicon-check.sh:33 files, all as expected.echidna corpus crossquery well-foundedness: crashes withmain'shol4.toml, prints 4 entries after.Note: the branch history includes a no-change merge joining the old #443 branch tip (the tree is identical to my commit); the diff against
mainis only this PR's changes.Generated by Claude Code