ci: test one Xcode per macOS version - #320
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We care about macOS coverage, not Xcode coverage — the framework's own build settings don't vary by Xcode version, and the runtime behavior we test is OS-level (launchd, codesigning, NSFileManager). Dropping the older-Xcode cells cuts the matrix from 8 to 5 (and removes the macos-15-intel/Xcode 16.4 cell that's been the slowest). Also rename the job to 'Build & Test (macOS <N> <arch>)' so the checks list reads as the OS/arch combination rather than the runner image label.
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We care about macOS coverage, not Xcode coverage — the framework's own build settings don't vary by Xcode version, and the runtime behavior under test is OS-level (launchd, codesigning,
NSFileManager). Dropping the older-Xcode cells cuts the matrix from 8 to 5 and removes themacos-15-intel + Xcode 16.4cell that's been the slowest.Also renames the job to
Build & Test (macOS <N> <arch>)so the checks list reads as the OS/arch combination rather than the runner image label.Build & Test (macOS 14 arm64)macos-14Build & Test (macOS 15 arm64)macos-15Build & Test (macOS 15 x86_64)macos-15-intelBuild & Test (macOS 26 arm64)macos-26Build & Test (macOS 26 x86_64)macos-26-intel