`limactl shell` should ask whether to start the instance when it is not running

[AkihiroSuda]

limactl edit already has Do you want to start the instance now? (Y/n) prompt.

lima/cmd/limactl/edit.go

Line 148 in 9fd8519

startNow, err := askWhetherToStart()

This should be available in limactl shell (lima) too.