ci: drop Windows and macOS runners#10845
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Remove the Windows/macOS unit-test matrix and the brew/choco install branches from setup-zebra-build. Unnecessary CI overhead: no relevant node operators run those OSes, and other enthusiasts can use Docker. Claude-Session: https://claude.ai/code/session_01VUPwpe81Ws8c5MeXWWgZb7
CI no longer builds or tests them, so they no longer meet the tier 2 "guaranteed to build" bar. Tier 3 = supported in code, untested, may or may not work — use Docker. Claude-Session: https://claude.ai/code/session_01VUPwpe81Ws8c5MeXWWgZb7
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Jun 28, 2026
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This turned out to be a lot more trivial than I thought. Adding any OS back should be trivial as well, then, if we ever find we need it back.
Remove the `cfg(not(windows))` / `cfg(not(macos))` skips and the nextest `delete_old_databases` Windows filter, now that neither platform runs in CI. For feature-combined gates, keep the `#[cfg(feature = ...)]` and drop only the OS predicate. Genuine platform-abstraction code (`stop()`, `random_known_port`, `default_lwd_cache_dir`) is left intact. Claude-Session: https://claude.ai/code/session_01VUPwpe81Ws8c5MeXWWgZb7
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Motivation
Closes #10844
Windows and macOS unit-test runners are unnecessary CI overhead. No relevant node operators run those OSes; other enthusiasts should use Docker.
Solution
Drop the Windows/macOS unit-test matrix and the brew/choco install branches from
setup-zebra-build. Linux only.Demote macOS and Windows from tier 2 to tier 3 in the platform-support docs, since CI no longer builds or tests them.
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