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Fix supervisor race condition when spawning child processes on Windows #18171

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Spawn supervised child suspended before job assignment

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Fix supervisor race condition when spawning child processes on Windows #18171

Spawn supervised child suspended before job assignment
70b0711
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CodSpeed HQ / CodSpeed Performance Analysis succeeded Feb 23, 2026 in 0s

Performance Gate Passed

✅ 5 untouched benchmarks

Comparing zb/fix-spawn-race (70b0711) with zb/fix-bounce-race-ii (155dd89)

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