perf(runner): create cold-start scratch dirs in one mkdir fork#805
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The run-output scratch directory and the shared temp directory were each created by a separate 'mkdir -p' fork at load. Create both in one call (2 -> 1 mkdir fork per cold start); matters across the acceptance suite's ~258 nested runs. No behaviour change.
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🤔 Background
Continuing the cold-start fork reduction from #798/#802/#803/#804. The run-output scratch dir and the shared temp dir were each created by a separate
mkdir -pfork at load.💡 Changes
mkdir -pcall (2 → 1mkdirfork per cold start).