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serve-question answered POST /build-path with 200 and only then wrote the flip file. The caller is a separate process, so the response could reach it while the server was still preempted before the write landed: a poller that trusted the 200 could look for the flip file and miss it. Measured on a loaded machine, the old order lost that race 29 times out of 40; writing first and answering after loses it 0 times out of 40. This is what made tests/serve-question.test.mjs fail intermittently in CI on the Node 22 job while passing on Node 24. AI-assisted change: diagnosed and implemented with Claude Code under maintainer direction. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>