windows: cap mach build parallelism at core count#83
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…kills 16GB CI runners (exit 143)
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Run 30008019312 died at exit 143 (runner SIGTERM) 10 min into the Rust compile burst with 109G disk free — the classic 16GB-runner memory kill: mach sizes parallelism by memory heuristics and over-commits when many rustc processes run concurrently.
-j$(nproc)caps it correctly on CI and is equally right on the 32-core sovereign builder.