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* feat(#4422): block merging into next/main while the base branch's Tests run is red Adds a next-health job to test.yml that checks the base branch's own last push-triggered Tests run via the GitHub API and fails the existing "Required tests" required check when it's red, with a maintainer-applied "fix-next" label as the explicit escape hatch for the fix-forward PR itself. No branch-protection config change needed — it rides the already-required check. The job is deliberately not gated behind preflight, same reasoning as the changes job: a compute-free API read has nothing to save by waiting. Documents the fix-next label in CONTRIBUTING.md and adds a property test locking the CLEAN/RED/INDETERMINATE classification's iff-relationship. This closes the second half of the 2026-09-06 RCA: three unrelated PRs merged on top of an already-broken next before anyone noticed it was red. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> * fix: close two zero-margin CI timing gaps found while verifying #4422 Discovered while watching this branch's own CI, root-caused via /diagnose rather than dismissed as Windows flakiness: 1. tests/gsd-check-update-worker-atomic-cache.test.cjs's outer timeout (15000ms) exactly matched the inner npm-view timeout the worker wraps (NPM_VIEW_TIMEOUT_MS, gsd-core/bin/check-latest-version.cjs). A slow registry response raced two SIGKILLs at the same instant, killing the worker before it could catch its own timeout and degrade gracefully. Windows's shell-wrapped npm subprocess made the race lose more often there, but the zero margin was platform-agnostic. Fixed by giving the test real headroom (+10s) beyond the named constant it wraps, plus an invariant test so the two values can't silently collide again. 2. scripts/run-tests.cjs's per-chunk weight budget (MAX_FILES_PER_CHUNK) let a Windows full-matrix chunk that was well under budget by the Linux/macOS-calibrated weight table (~32/60 units) still exceed the 600s wall-clock backstop — codex-config.test.cjs's genuinely-measured weight (17.87) doesn't transfer 1:1 to Windows's slower install/ subprocess overhead. Windows now gets its own lower cap (40 vs 60). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> --------- Co-authored-by: sim <sim@local> Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
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