[lan17]

Problem

Reported in the maintainer's session: full formal run 41452535665 could not merge passing Go mutation shards because floating Node 24 resolved to v24.22.1 on shard 1 and v24.22.0 on shard 11. Strict provenance correctly rejected the mismatch.

Change

Type: Tooling. Pin the shared setup-validation action to Node 24.22.1 so generation, replay, mutation shards and merge jobs use the same exact patch regardless of runner caches. Keep strict artifact provenance validation unchanged. Add a workflow-shape regression requiring an exact Node 24 patch and shared setup across formal jobs, without direct per-job setup-node overrides. No design record is needed; this restores reproducible tooling without changing conformance criteria. Release and consumer-floor versions are unchanged.

Open questions

Full verification is required for this language toolchain pin. The available GitHub connector has no workflow-dispatch action and the local gh CLI is unauthenticated; after PR CI passes, dispatch formal-full.yaml in full mode on this branch before leaving draft.

Validation

Head: 3e3fb23e239dae2fb1d06f7ef4bd985794f0e372

• New regression on parent bae1e5e plus test only: fails as expected because 24 is not an exact patch.
• Final tree: corepack pnpm --dir typescript exec vitest run test/formal-validation.test.ts test/formal-mutation-shards.test.ts: 59 tests passed, including strict Node provenance rejection.
• Final tree: corepack pnpm --dir typescript typecheck: passed.
• Final tree: make audit: passed.
• Final tree: git diff --check: passed; independent diff review found no blocking issues.

Not run: PR CI pending creation; Full verification pending the dispatch access described above. Local focused checks do not substitute for either.

Follow-ups

None.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.67%. Comparing base (bae1e5e) to head (3e3fb23).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #251      +/-   ##
==========================================
- Coverage   94.67%   94.67%   -0.01%     
==========================================
  Files          84       84              
  Lines       13026    13026              
  Branches      805      805              
==========================================
- Hits        12333    12332       -1     
- Misses        627      628       +1     
  Partials       66       66              

Flag	Coverage Δ
go	93.25% <ø> (-0.05%)	⬇️
python	93.60% <ø> (ø)
rust	94.78% <ø> (ø)
typescript	97.21% <ø> (ø)

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