Revert "Require signed packages from the Omarchy repository"

Reverts 39cffb8f, which landed on quattro through an accidental direct
push. The change returns for review as a pull request.

migrations/1787589206.sh

@@ -1,20 +0,0 @@
-echo "Require signed packages from the Omarchy repository"
-
-# The [omarchy] repo predates the Omarchy packaging key, so existing installs
-# carry a SigLevel override that also accepts unsigned packages. Packages are
-# signed now, so drop the override and let the repo inherit the global
-# SigLevel = Required DatabaseOptional like every other repo. Machine-wide and
-# self-detecting, so another user's rerun no-ops.
-omarchy_sig_override='SigLevel = Optional TrustAll'
-
-if [[ -f /etc/pacman.conf ]] &&
-  sed -n '/^\[omarchy\]/,/^\[/p' /etc/pacman.conf | grep -qxF "$omarchy_sig_override"; then
-  # Requiring signatures with an untrusted packaging key would fail every
-  # omarchy transaction, including the one that could repair it.
-  if omarchy-pkg-missing omarchy-keyring ||
-    ! sudo pacman-key --list-keys 40DFB630FF42BCFFB047046CF0134EE680CAC571 &>/dev/null; then
-    omarchy-update-keyring
-  fi
-
-  sudo sed -i "/^\[omarchy\]/,/^\[/{/^$omarchy_sig_override$/d}" /etc/pacman.conf
-fi