feat: vmsuite.sh and the cli suite: G1-G3, F1-F7 of TESTPLAN.md as unattended checks

Each block in share/vmtest/<suite>/ starts from a fresh ssh-ready snapshot, gets a
Plasma session environment over ssh (the theme item needs one) and prints PASS/FAIL
lines. ONLY=<prefix> runs one block. 55 checks pass on the plain CachyOS VM.

share/vmtest/prelude.sh

@@ -0,0 +1,16 @@
+# Sent to the guest in front of every block (scripts/vmsuite.sh): helpers and Steamify's libs.
+# ssh has no Plasma session: the theme item (Vapor layout) needs one (vmrun.sh does the same).
+export XDG_RUNTIME_DIR=/run/user/$(id -u) WAYLAND_DISPLAY=wayland-0 DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/$(id -u)/bus
+pass() { echo "PASS $*"; }; fail() { echo "FAIL $*"; }; skip() { echo "SKIP $*"; }
+sudo mountpoint -q /mnt || sudo mount -t 9p -o trans=virtio,version=9p2000.L repo /mnt
+cd /mnt || exit 1
+for lib in common state packages login-manager single-user steam-desktop steam-machine fremont-poweroff vram-booster hdmi-refresh cec boot-session vapor-theme steamos-extras bios desktop-shortcut wizard-shortcut steam-game update-notifier; do
+    # shellcheck source=/dev/null
+    . "lib/$lib.sh" 2>/dev/null
+done
+sf() { bash /mnt/steamify.sh "$@" < /dev/null 2>&1 | sed 's/\x1b\[[0-9;]*m//g'; return "${PIPESTATUS[0]}"; }
+# is <item>: Steamify's own status function (what the menu ticks); isnt <item>
+is()   { "${1}_status" 2>/dev/null; }
+expect_on()  { local i; for i in "$@"; do is "$i" && pass "$i is on" || fail "$i is off"; done; }
+expect_off() { local i; for i in "$@"; do is "$i" && fail "$i is on" || pass "$i is off"; done; }
+ticks() { local i; for i in gaming theme glyphs single launcher notify vram cec machine poweroff boot; do is "$i" && printf '%s ' "$i"; done; echo; }