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ci: migrate retiring macOS 14 runners to macOS 15 - #64
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Summary
Replace macos-14 with explicit macos-15 in the maintained CI matrix. The runner architecture remains arm64; compiler/dependency pins, commands, checks and permissions are unchanged. No source or generated API changes.
Reproduced failure
Vulkan post-merge run 41128715263 failed twice before the macOS job obtained a runner. The job annotation explicitly identifies the scheduled macOS 14 brownout. GitHub retires these images on November 2, 2026: actions/runner-images#13518
Validation
Workflow YAML parses successfully and git diff --check passes. Current-head hosted CI validates the replacement image before merge. For memory, the manual benchmark workflow is updated alongside ordinary CI.