feat(suspend): disable system suspend until hardened kernel resume issue is fixed

linux-hardened wedges on resume from S3 (NVMe/i915/iwlwifi driver UAF
exposed by INIT_ON_FREE + slab hardening). Until root-caused, take
suspend off the table while keeping lock + DPMS intact.

- etc/systemd/logind.conf.d/20-no-suspend.conf: lid close, suspend
  key, hibernate key all map to 'lock'; IdleAction=ignore (swayidle
  drives DPMS+swaylock independently).
- run_onchange_after_deploy-etc.sh.tmpl: mask sleep.target,
  suspend.target, hibernate.target, hybrid-sleep.target,
  suspend-then-hibernate.target via /etc/systemd/system -> /dev/null
  symlinks. Catches 'systemctl suspend' from any source.
- dot_config/sway/config: XF86Sleep and system-mode 's' now run
  loginctl lock-session instead of systemctl suspend.
- dot_config/sway/executable_power-menu.sh: drop Suspend entry.
- KEYBINDS.md: reflect new behaviour.

To re-enable later: remove the logind drop-in + symlink loop, then
sudo systemctl daemon-reload.

2 files changed, 5 insertions, 8 deletions

diff --git a/dot_config/sway/config b/dot_config/sway/config
index 48e5993..817e7c4 100644
--- a/dot_config/sway/config
+++ b/dot_config/sway/config
@@ -173,7 +173,7 @@ bindsym $mod+Ctrl+bracketleft exec ~/.config/sway/brightness-osd.sh down
 bindsym XF86AudioMicMute exec pactl set-source-mute @DEFAULT_SOURCE@ toggle
 bindsym XF86Bluetooth exec ~/.config/sway/bt-toggle.sh
 bindsym XF86ScreenSaver exec "playerctl -a pause; swaylock -f -e -c 000000"
-bindsym XF86Sleep exec systemctl suspend
+bindsym XF86Sleep exec loginctl lock-session
 bindsym XF86WLAN exec ~/.config/waybar/wifi-toggle.sh
 bindsym XF86RFKill exec rfkill toggle all
 
@@ -225,13 +225,13 @@ bindsym $mod+z mode "qr"
 
 # System / hardware submode — non-XF86 alternatives for the rarely used
 # hardware toggles and TUI launchers above. Enter with Super+x; mnemonic
-# letters (b=bluetooth, w=wifi, r=rfkill, s=sleep, d=display,
+# letters (b=bluetooth, w=wifi, r=rfkill, s=lock-session, d=display,
 # v=volume-mixer, k=keybinds, m=notification-picker).
 mode "system" {
     bindsym b exec ~/.config/sway/bt-toggle.sh, mode "default"
     bindsym w exec ~/.config/waybar/wifi-toggle.sh, mode "default"
     bindsym r exec rfkill toggle all, mode "default"
-    bindsym s exec systemctl suspend, mode "default"
+    bindsym s exec loginctl lock-session, mode "default"
     bindsym d exec ~/.config/sway/display-toggle.sh, mode "default"
     bindsym v exec $term --class=floating -e pulsemixer, mode "default"
     bindsym k exec $term --class=floating -e glow -p ~/dotfiles/KEYBINDS.md, mode "default"
diff --git a/dot_config/sway/executable_power-menu.sh b/dot_config/sway/executable_power-menu.sh
index 999259c..0a7de91 100644
--- a/dot_config/sway/executable_power-menu.sh
+++ b/dot_config/sway/executable_power-menu.sh
@@ -2,9 +2,10 @@
 # Keyboard-driven power menu via wofi --dmenu (j/k navigation).
 set -eu
 
+# Suspend entry intentionally omitted while suspend is disabled
+# system-wide. See etc/systemd/logind.conf.d/20-no-suspend.conf.
 choice=$(printf '%s\n' \
   "  Lock" \
-  "  Suspend" \
   "  Logout" \
   "  Reboot" \
   "  Poweroff" |
@@ -17,10 +18,6 @@ case "$choice" in
     playerctl -a pause
     exec swaylock -f -e -c 000000
     ;;
-  *Suspend)
-    playerctl -a pause
-    exec systemctl suspend
-    ;;
   *Logout) exec swaymsg exit ;;
   *Reboot) exec systemctl reboot ;;
   *Poweroff) exec systemctl poweroff ;;