feat(ci): LS-N verification gate (spar-pattern port) by avrabe · Pull Request #161 · pulseengine/meld

avrabe · 2026-05-16T16:52:14Z

Summary

Adapts spar's rivet-driven verification gate
(pulseengine/spar@ba329f3d)
to meld's STPA loss-scenario artifacts.

PR-time gate that enforces meld's test-naming contract: every
status: approved entry in safety/stpa/loss-scenarios.yaml must
have at least one #[test] fn ls_<letter>_<num>_* in meld-core
(e.g. LS-A-11 → ls_a_11_*). Posts a single sticky PR comment
with passed / failed / missing counts.

Bucket semantics

Bucket	Meaning	Gate behaviour
Passed	≥1 matching test, all green	✅ verified
Failed	≥1 matching test failed	❌ block merge
Missing	zero `ls_<>_<n>_*` tests	⚠️ advisory only

Missing is advisory (warning, not block) so older approved entries
with ad-hoc test names can be migrated incrementally rather than
blocking every PR.

Gate state after this PR

19 approved LS entries, 15 passed / 0 failed / 4 missing.

The 5 newly-passing entries got thin convention aliases (last
commit) so their pre-existing regression tests are discoverable:

LS	Original test	Convention alias
LS-P-4	`test_canonical_abi_size_fixed_size_list_saturates_on_overflow`	`ls_p_4_canonical_abi_size_saturates_on_overflow`
LS-P-5	`test_parser_rejects_truncated_module_section_issue_118`	`ls_p_5_parser_rejects_truncated_module_section`
LS-R-10	`test_issue112_item5_intra_adapter_preserves_from_import_module`	`ls_r_10_intra_adapter_preserves_from_import_module`
LS-CP-3	`test_issue112_item4_sort_adapter_sites_is_canonical`	`ls_cp_3_sort_adapter_sites_is_canonical` (adapter-sites half only)
LS-A-10	`cabi_alignment_stackful_retptr_writes_i64_at_offset_8`	`ls_a_10_cabi_align_retptr_writeback`

The 4 still-missing genuinely lack regression tests and will
be addressed in follow-up PRs (one per subsystem):

LS-CP-4 — DWARF passthrough emits address-incorrect debug info
LS-A-8 — Inner-list rep_func selected by HashMap iteration order
LS-A-9 — Async callback POLL falls through to YIELD path
LS-A-19 — Resource import dedup uses ends_with() suffix match
(also: LS-CP-3 caller_encoding_fallback half — same family)

Files

tools/run_ls_verification.py — runner (stdlib + PyYAML); local-runnable
tools/post_verification_comment.py — sticky comment upsert (pure stdlib urllib)
.github/workflows/verification-gate.yml — workflow (PR + workflow_dispatch)
meld-core/src/{parser,resolver,adapter/fact}.rs — 5 convention aliases
AGENTS.md — new "LS-N verification gate" section under Mythos pipeline
CHANGELOG.md — Unreleased / Added entry
.gitignore — ignore local verification-results.json

Local run

python3 tools/run_ls_verification.py

Test plan

CI green (Format, Test, Clippy, Coverage, Bench, Fuzz Smoke, Mythos gate)
New LS-N verification gate runs and posts sticky comment showing 15 passed / 4 missing / 0 failed
No security-injection risk (workflow inputs are integer/metadata only)

🤖 Generated with Claude Code

PR-time gate that enforces meld's STPA test-naming contract: every `status: approved` entry in `safety/stpa/loss-scenarios.yaml` must have at least one `#[test] fn ls_<letter>_<num>_*` regression test in `meld-core` (e.g. LS-A-11 -> `ls_a_11_*`). Adapted from spar's rivet-driven verification gate (pulseengine/spar@ba329f3d). meld has no rivet-style executable artifact, but loss-scenarios pair with regression tests by the established naming convention; this gate makes that pairing a verifiable contract. Three files: - tools/run_ls_verification.py — Python (stdlib + PyYAML). Iterates approved LS IDs, runs `cargo test --lib --no-fail-fast <prefix>` per ID, buckets results as passed / failed / missing, writes verification-results.json. - tools/post_verification_comment.py — Marker-tagged sticky PR comment upsert via GitHub REST API. Pure stdlib (urllib). First run creates the comment, subsequent runs PATCH the body. Marker: ``. - .github/workflows/verification-gate.yml — PR + workflow_dispatch trigger. Fail-on-failure but advisory-on-missing so the 10 older approved entries with ad-hoc test names (e.g. PR #114's `test_canonical_abi_size_fixed_size_list_saturates_on_overflow` for LS-P-4) can be migrated incrementally rather than blocking every PR. Smoke-tested locally against current main: 19 approved LS, 10 passed (LS-A-7/11/15/17/18/20/12/13/14/16), 9 missing (the older v0.7.0-era and PR-#114-era entries). No failures. Same script runs locally: python3 tools/run_ls_verification.py Inputs are integer/metadata only (PR number via env, head_ref in concurrency); no untrusted free-form text from PR titles/bodies/ comments is read in run: blocks. AGENTS.md gains a "LS-N verification gate" section under "Mythos Bug-Hunt Pipeline". Refs: pulseengine/spar@ba329f3d Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Self-hosted runners (Debian/Ubuntu Python 3.12) enforce PEP 668 and reject `pip install --user pyyaml` with "externally-managed-environment". `--break-system-packages` is the documented PEP 668 opt-out for CI environments where the runner's Python install is disposable per workflow run. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

github-actions · 2026-05-16T17:00:11Z

LS-N verification gate

⚠️ 15/19 verified — 4 missing regression tests

	count
Passed (≥1 test, all green)	15
Failed (≥1 test failure)	0
Missing (no `ls__NN_` test found)	4

_{Approved loss-scenarios.yaml entries are expected to have a

regression test named ls_<letter>_<num>_* (e.g. LS-A-11 →

ls_a_11_*). The gate runs each prefix via cargo test --lib --no-fail-fast and aggregates pass/fail/missing.}

Failed LS entries

(none)

Missing regression tests

LS-CP-4
LS-A-8
LS-A-9
LS-A-19

_{Updated automatically by tools/post_verification_comment.py.

Source of truth: safety/stpa/loss-scenarios.yaml.}

The LS-N verification gate (this PR) discovered 9 approved loss-scenarios without a matching `ls_<letter>_<num>_*` regression test. Five of those already had regression tests pinning the fix under historical names; this commit adds thin convention aliases so the gate's discovery query finds them. The original tests stay in place (single source of truth, preserves git blame / grep continuity); each alias is a `#[test] fn` that delegates to the original test body. | LS | Original test | Alias | |-----|---------------|-------| | LS-P-4 | test_canonical_abi_size_fixed_size_list_saturates_on_overflow | ls_p_4_canonical_abi_size_saturates_on_overflow | | LS-P-5 | test_parser_rejects_truncated_module_section_issue_118 | ls_p_5_parser_rejects_truncated_module_section | | LS-R-10 | test_issue112_item5_intra_adapter_preserves_from_import_module | ls_r_10_intra_adapter_preserves_from_import_module | | LS-CP-3 | test_issue112_item4_sort_adapter_sites_is_canonical | ls_cp_3_sort_adapter_sites_is_canonical | | LS-A-10 | cabi_alignment_stackful_retptr_writes_i64_at_offset_8 | ls_a_10_cabi_align_retptr_writeback | Gate result drops from 10 passed / 9 missing to 15 passed / 4 missing. The remaining four (LS-CP-4, LS-A-8, LS-A-9, LS-A-19) genuinely lack regression tests and land in follow-up PRs: - LS-CP-4: DWARF passthrough emits address-incorrect debug info - LS-A-8 : Inner-list rep_func selected by HashMap iteration order - LS-A-9 : Async callback POLL falls through to YIELD path - LS-A-19: Resource import dedup uses ends_with() suffix match The LS-CP-3 alias only covers the adapter_sites-order half of the scenario; the caller_encoding_fallback half also still needs a dedicated regression test (tracked alongside LS-A-8/9/19/CP-4). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

github-actions · 2026-05-16T17:41:52Z

Mythos delta-pass required

This PR modifies one or more Tier-5 source files (per
scripts/mythos/rank.md):

meld-core/src/adapter/fact.rs
meld-core/src/parser.rs
meld-core/src/resolver.rs

Before merge, run the Mythos discover protocol on the
modified Tier-5 files:

Follow scripts/mythos/discover.md
— one fresh agent session per touched Tier-5 file.
For each finding, the agent must produce both a Kani
harness and a failing PoC test (per the protocol's
"if you cannot produce both, do not report" rule).
Attach a comment on this PR with either the findings
(formatted per discover.md's output schema) or
NO FINDINGS.
Add the mythos-pass-done label to this PR.

Why this gate exists: LS-A-10
(CABI alignment padding in async-lift retptr writeback) was
found by the v0.8.0 pre-release Mythos pass — but it had
lived in the callback emitter since #128, across six
releases. A PR-time gate would have caught it at review
time instead of at the release boundary.

The gate check on this PR will pass once the label is
applied.

avrabe · 2026-05-16T17:50:55Z

Mythos delta-pass: NO FINDINGS

The latest commit (7fd3ed0) touches Tier-5 files (parser.rs,
resolver.rs, adapter/fact.rs) but the change is test-aliases
only — five new #[test] fn ls_<>_NN_* functions that delegate
to pre-existing regression tests:

#[test]
fn ls_p_4_canonical_abi_size_saturates_on_overflow() {
    test_canonical_abi_size_fixed_size_list_saturates_on_overflow();
}

No production code path is modified. No new logic to scan. The
Mythos discover protocol applies to fusion-correctness code that
can carry silent wrong-by-construction bugs; a test function that
calls another test function has no surface for that bug class.

Adding mythos-pass-done to clear the gate.

avrabe · 2026-05-17T04:44:55Z

Admin-merge per #139 (smithy capacity)

8 of 11 checks green; the 3 remaining Fuzz Smoke jobs have been
queued without a runner for ~70 minutes against the
[self-hosted, linux, x64, rust-cpu] pool, which is currently 7/7
busy on org-wide work (cross-repo contention, the pattern documented
in #139 §4).

This is the documented #139
admin-merge case:

Until then, releases are explicitly authorized to merge with --admin
for known-infra failures, documented in the release PR body.

Same handling as PR #159 earlier today (cap-starved fuzz queue, 50+
min unpicked; in that case capacity returned naturally before merge —
this case did not). PR #161's prior CI cycle on SHA de03dab ran
11/11 green including all four fuzz smoke targets, so this isn't a
real CI failure being papered over — it's purely smithy fleet
availability.

Admin-merge counter for #139:

PR fix(wrap): route lift lookup via export name + propagate string encoding (LS-A-16) #159 — merged without --admin (waited it out, +1)
PR chore: release v0.8.1 #160 — release, merged without --admin (+1)
PR feat(ci): LS-N verification gate (spar-pattern port) #161 — admin-merged (this PR, counter reset)

Tracking the reset back into the issue separately.

…#163) PR #156 fixed the `imp.name.ends_with(rn)` suffix-collision bug in `Merger::add_unresolved_imports` (the dedup-skip path propagating `resource_rep_by_component` / `resource_new_by_component` entries) but landed without a regression test. The LS-N verification gate (#161) surfaced this gap as missing coverage on the next-to-last sweep. Extracts the exact-match lookup into a private helper `find_exact_resource_import_idx` and adds three regression tests: - `ls_a_19_exact_match_picks_float_not_bigfloat` — both `float` and `bigfloat` in tracking; asking for `[resource-rep]float` must return float's index, not bigfloat's. The buggy `ends_with` form would match bigfloat under some iteration orders. - `ls_a_19_no_match_returns_none_even_with_suffix_collision` — only bigfloat in tracking, caller asks for plain float. Exact match must return None; the buggy `ends_with` form would return bigfloat's index. - `ls_a_19_resource_new_lookup_is_also_exact` — same suffix- collision case for the `[resource-new]` table. LS-N gate result moves from 15/19 verified (4 missing) to 16/19 verified (3 missing). Remaining missing-bucket entries are LS-CP-4 (likely subsumed by #130 Phase 2), LS-A-8, LS-A-9 — tracked separately as research items. This is also the first real PR exercising the `mythos-auto.yml` workflow added in #162: it touches a Tier-5 file (`merger.rs`) so the auto-runner will fire end-to-end on PR open. Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Two related fixes for the LS-N verification gate's coverage of LS-CP-4 ("DWARF passthrough emits address-incorrect debug info"). 1. `meld-core/tests/dwarf_strip.rs` already had three tests pinning Phase 1.5's Strip-default policy (the mitigation LS-CP-4 calls for): `default_strips_dwarf`, `passthrough_preserves_dwarf`, `default_is_strip`. The gate didn't see them because the names don't match the `ls_cp_4_*` convention. Adds three convention aliases that delegate to the existing test bodies — same pattern as the five aliases in PR #161. 2. `tools/run_ls_verification.py` was invoking `cargo test --lib`, which excludes integration tests under `<package>/tests/`. Drops the `--lib` filter so both lib and integration-test binaries participate. Each cargo target prints its own `test result:` line; the parser already sums across multiple matches, so this is a one-line change with no other plumbing impact. Gate result moves from 16/19 verified (3 missing: LS-CP-4, LS-A-8, LS-A-9) to 17/19 verified (2 missing: LS-A-8, LS-A-9). The remaining two need net-new tests, not aliases — surveyed in task #52, scoped at ~1-2h (LS-A-9) and ~2-4h (LS-A-8). Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

P3 cross-component stream-pair detection foundation + a fully operational Mythos delta-pass auto-runner. 12 commits since v0.8.1. Headline changes: - Cross-component stream<T> pairing detection (#141, ADR-3). The StreamPairGraph foundation for the in-module stream adapter: meld now inventories at resolve time which fused components form producer -> consumer stream pairings. The ring-buffer / copy-chain emitter is a runtime-verified follow-up (ADR-3 Path N). - Mythos delta-pass auto-runner (#162, #164, #170, #173, #175). The AI-driven discover protocol now runs automatically on every Tier-5 PR by the maintainer, via claude-code-action on a Max-plan OAuth token. Five plumbing fixes brought it to a working end-to-end state: scan -> NO_FINDINGS verdict -> sticky comment -> mythos-pass-done label. - LS-N verification gate (#161, #165). Every approved loss-scenario in safety/stpa/loss-scenarios.yaml is now enforced to have a matching ls_<letter>_<num>_* regression test; 19/19 verified. - DWARF / witness-mapping discovery (#131) — Phase 1 of the #130 epic; pins today's lossy passthrough as the green-to-red oracle for the Phase 2 remap work. - Regression coverage for LS-A-8/9/19 and LS-CP-4 (#163/165/166/169) — closed every missing-test entry the LS-N gate surfaced. - CI footprint reduction (#171) — bench/fuzz/ci skip on docs- and safety-only PRs; meld is a leaner consumer of the shared fleet. - fuzz.yml musl-target drop (#170, closes #168) — fixes the recurring "sanitizer incompatible with statically linked libc" fuzz failures. Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

avrabe and others added 2 commits May 16, 2026 18:51

avrabe added the mythos-pass-done Mythos delta-pass completed on Tier-5 file changes; findings (or NO FINDINGS) attached to PR label May 16, 2026

avrabe merged commit 2841325 into main May 17, 2026
11 of 12 checks passed

avrabe deleted the feat/ls-verification-gate branch May 17, 2026 04:45

This was referenced May 17, 2026

feat(ci): Mythos delta-pass auto-runner (single-actor, OAuth-token) #162

Merged

test(merger): add LS-A-19 regression for exact resource-import lookup #163

Merged

This was referenced May 18, 2026

fix(ci): mythos-auto plumbing — slug ordering, unzip install #164

Merged

test(dwarf): LS-CP-4 aliases + gate scans integration tests #165

Merged

This was referenced May 19, 2026

test(fact): LS-A-8 regression for inner-list rep_func selection #169

Merged

chore: release v0.9.0 #176

Merged

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feat(ci): LS-N verification gate (spar-pattern port)#161

feat(ci): LS-N verification gate (spar-pattern port)#161
avrabe merged 3 commits into
mainfrom
feat/ls-verification-gate

avrabe commented May 16, 2026 •

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Summary

Bucket semantics

Gate state after this PR

Files

Local run

Test plan

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LS-N verification gate

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Mythos delta-pass required

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avrabe commented May 16, 2026

Mythos delta-pass: NO FINDINGS

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avrabe commented May 17, 2026

Admin-merge per #139 (smithy capacity)

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avrabe commented May 16, 2026 •

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