feat(parallel): add --jobs auto to cap concurrency at CPU cores#771
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This was referenced Jul 12, 2026
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🤔 Background
Related #766
--parallelruns with unlimited concurrency by default, which oversubscribes cores on busy machines. This adds an opt-inautocap without a benchmark-gated default change.💡 Changes
--jobs auto/-j autoto cap parallel concurrency at the detected CPU core count.bashunit::check_os::nproc, portable across Linux/macOS/BSD (nproc→sysctl→getconf, fallback 4).--jobs 0); explicit-j Nunchanged. Docs + help text updated.