## Why
A stopped provisioning service is treated as unavailable by the connection path, preventing registered Core setup from provisioning the sandbox.
## What changed
Start a stopped Windows sandbox service before provisioning during explicit registered Core setup. Request service-start permission through the Windows Service Control Manager and tolerate the service already running if another caller starts it concurrently. Preserve existing unavailable-service handling when the service is missing or marked for deletion.
GitOrigin-RevId: fab87c10dfabd4324f631077262f7e0dccc170f6