Run 37148409574 (with the delegate writers merged) killed windows.ps1 0.4 s after its
`hermes update` child appeared, before that child reached UpdateLock.acquire(), so it
measured python start-up instead of the delegate contract. Wait for the child's
"Updating Hermes Agent..." banner in update.log (printed only after acquire) too.
(cherry picked from commit 274861c4ac40802afa03389a668d08e9c568d92c)
(cherry picked from commit 1f4d1ecd724285d00f898603f85fbf491b00900f)