ci(tests): shard the macOS job like Windows#795
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The macOS job ran the whole suite as one monolithic sequential 'make test', which intermittently OOM-killed (Killed: 9), hung (orphan process -> 10-min timeout), or abort-trapped on the resource-constrained runner. Split it into a parallel unit/functional matrix plus push-gated acceptance shards, mirroring the Windows setup. The c-shard globs all c* files and the last shard is [q-z] so no test file is dropped.
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🤔 Background
The macOS CI job ran the whole suite as one monolithic sequential
make test. On the resource-constrainedmacos-latestrunner this intermittently OOM-killed (Killed: 9), hung (orphan process → 10-min timeout), or abort-trapped — turning macOS red across many unrelated commits. Every other multi-test OS (Windows) is already sharded.💡 Changes
--parallel --jobs 4, mirroring the existing Windows layoutc*files (Windows missescolors/completions) and the final shard is[q-z], so no test file is silently dropped