Henrik Muehe 3d73e6c59d install.sh: mask sysstat, replace dphys-swapfile with fstab entry ...

Round-3 cold-boot trims:
- mask sysstat.service (sadc CPU/IO logger; nothing reads it).
- mask dphys-swapfile.service and add /var/swap to /etc/fstab so swap
  is brought up by systemd at local-fs.target instead of by an LSB
  wrapper that re-checks the swap file size on every boot.

Both are reversible: `systemctl unmask <unit>` and remove the fstab
line. Before doing the dphys swap, install.sh verifies /var/swap
exists; on a fresh image where the file hasn't been created yet,
nothing is changed and dphys-swapfile keeps running normally.

Userspace boot 11.5s -> 10.7-11.4s on clean runs; bbctrl listen
unchanged at boot+10.4s (the saving moves to chromium/multi-user).

2026-05-01 10:31:40 +02:00

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