[vt128]

GitHub retired the macos-14 runner image on November 2, 2026. Consumers of the shared workflow now have their macOS jobs cancelled before tests start: the current qrcode run reports The configuration 'macos-14-arm64-us-default' is not supported on the latest-Go leg; the floor leg has the same scheduler error.

Use the supported macos-15 image in the shared matrix and synchronize its comments and documentation. The runner selects the CI host; it does not set the module's Go floor or supported OS baseline. The README's stale latest-Go example is aligned with the existing 1.27.x matrix.

Validation: Go 1.27.3 locally and offline Linux amd64 Go 1.19.13 pass go test -race -count=2 ./..., go vet ./..., and formatting checks. Actionlint workflow-syntax checks pass. Default actionlint/ShellCheck reports the same 11 existing Analyze-script diagnostics as the base commit; no new diagnostics were introduced. The PR self-test must exercise both Go versions on all three OS images before consumers adopt this SHA.

Tracks STAR-100. Official retirement notice.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.56%. Comparing base (23f088b) to head (1dfd135).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #16   +/-   ##
=======================================
  Coverage   61.56%   61.56%           
=======================================
  Files           4        4           
  Lines         333      333           
=======================================
  Hits          205      205           
  Misses        119      119           
  Partials        9        9           

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