On Windows the run overshot its deadline by 450-720 ms in the R2 bands: ~200 ms of
interpreter start and imports ran before the clock, the hard stop sat 0.3 s after the
deadline, and the test timed bash, env and the py launcher too. The clock now starts at
process creation (GetProcessTimes), the reply wait ends 0.1 s early so the kill and exit
fit, and the hard stop is the deadline itself. Residual outside the script: the py
launcher (40-130 ms, rare spikes to 300) and the creation call. R2 times the interpreter
directly, best of two, bands -250/+100 ms around the deadline.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Eureka
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