Add a VM storage lock preflight in setup_machine.sh before both
`make boot` and `make boot_dfu`. Detects active lock holders for
nvram.bin, machineIdentifier.bin, Disk.img, and SEPStorage via lsof,
prints PID/PPID/command details, and supports optional automatic
recovery with AUTO_KILL_VM_LOCKS=1.
Fixes#55.
Co-authored-by: tastyheadphones <[email protected]>
