Well-structured CI consolidation. Replacing 7 bespoke actions with 3 composable ones, centralizing tool versions in mise.toml, and adding a lockstep check script is a meaningful reduction in maintenance surface. The supply chain posture improved: SHA256-pinned mise binary replaces curl-piped remote scripts, and cache writes are restricted to main (preventing fork-based cache poisoning). CI passing across 29 jobs is strong evidence the migration is correct.

Severity count: 7 P3, 1 P4, 4 Nit, 1 Note.

The check_mise_versions.sh script has 10 check_value calls, but 2 of them (lines 26 and 68) compare a variable to itself, reducing to non-empty guards dressed as cross-validation. The PR testing section says the script "runs successfully," which is tautological for these inputs. A negative test (temporarily desync one file) would have surfaced this.

Meruem proposes a clean class fix: split check_value into check_not_empty(label, value) for source-of-truth extractions and check_equal(label, actual, expected) for cross-references. That makes intent visible at every call site and prevents future callers from copying the self-comparison pattern.

The lint-actions runner was upgraded from ubuntu-22.04 to ubuntu-24.04 without mention in the PR description. It works (CI passed), but a silent runner upgrade in a tooling PR can surprise reviewers.

"Two guards that guard nothing. Shall we see what they protect?" - Hisoka

go.mod:659

P4 [CRF-2] actionlint/cmd/actionlint Go tool dependency is now orphaned.

The Makefile lint/actions/actionlint target changed from go tool github.com/rhysd/actionlint/cmd/actionlint to mise exec actionlint -- actionlint. No remaining go tool or go install references for actionlint in the codebase. The go.mod tool entry and its go.sum entries are dead weight. (Netero)

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All 14 R1 findings addressed. Every fix verified at root cause: check_value split into check_not_empty/check_equal, TYPOS_VERSION eager eval removed entirely, awk parser extracted to shared mise_checksum.sh, Go tool retry wrapping restored, GH_TOKEN rationale comment added, lint-light and action descriptions corrected, orphaned go.mod entries removed. Clean, thorough follow-up.

CRF-3 (Puppeteer scope) closed by panel (12/12 accept). The author explained the steps fix a weekly-docs failure this PR was scoped to address.

R2 severity count: 3 P3, 2 P4, 2 Nit. Nothing blocking.

The lint/go target now runs bare golangci-lint and paralleltestctx via mise shims, but CONTRIBUTING.md's non-DevContainer setup path doesn't mention mise as a prerequisite. Worth updating before merge so contributors don't hit a cryptic "command not found" on make lint.

"What happens when you set a variable to nothing? Is it absent, or is it an empty answer?" - Hisoka, R1 (before the author removed the step entirely)

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All 7 R2 findings addressed. The SRI hash cross-validation (CRF-20) was particularly well done: the author added an sri_sha256_to_hex function and loops over all four Nix targets comparing decoded hashes against checksums.toml. CONTRIBUTING.md now documents mise for manual setup. Puppeteer version guard added with exactly the suggested pattern.

R3 severity count: 2 P3, 1 P4, 1 Nit. Nothing blocking.

The lockstep script now validates 5 of 6 checksum platforms (linux-x64, linux-arm64, macos-x64, macos-arm64 via SRI cross-check; linux-x64 again via dogfood). The windows-x64 entry is the one gap. The CONTRIBUTING.md wording creates a confusing double-install path for new contributors.

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