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init_vm_paths suffixed the disk and NVRAM by FS_PROFILE but left PID_FILE, MONITOR_SOCK, and SERIAL_LOG shared. A concurrent btrfs and zfs run read each other's PID file, so the second run's stop logic could kill the first run's VM. All runtime paths now carry the suffix.
kill_qemu sent kill -9 and returned without waiting, so the force-kill fallback could run qemu-img snapshot against a qcow2 the dying qemu still held locked (the restore failed silently behind || true, leaving the base image dirty). It now reaps or polls the process to death before returning.
debug-vm.sh hardcoded the btrfs base-disk name, so FS_PROFILE=zfs booted the wrong base or fatalled. It now takes DISK_PATH from init_vm_paths.
Both runners reported a completion-marker grep as "ArchSetup Exit Code," but the installer runs detached with set -e off, so its real exit status was never captured -- a run that errored mid-way and still reached its last line reported exit 0. The flag is now ARCHSETUP_COMPLETED with the report labeled honestly; Testinfra stays the pass/fail authority.
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