Running "npm run dev" as a tracked agent task gets the process killed
when the runtime cap is reached, which leaves the machine with no dev
server on port 6001. This script starts it with Start-Process so it
survives session churn, and it refuses to start a second server when
the port is already taken.
The older .run-dev.ps1 in the same folder is broken and is replaced by
this one: it invokes the Next binary without its extension, which
PowerShell cannot execute, so node.exe is called explicitly instead.
