Revert "fix(edge-flash-wear): keep the pacman package cache empty"

The package cache is a disk-space concern of the package upgrades, not
flash wear; it moves to the os-update role.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ansible/roles/edge-flash-wear/files/edge-pacman-cache.hook

@@ -1,13 +0,0 @@
-# Managed by ansible (roles/edge-flash-wear).
-# The root filesystem is a ~7 GB eMMC; downloaded packages are not kept.
-[Trigger]
-Operation = Install
-Operation = Upgrade
-Operation = Remove
-Type = Package
-Target = *
-
-[Action]
-Description = Removing downloaded packages from the cache...
-When = PostTransaction
-Exec = /usr/bin/find /var/cache/pacman/pkg -mindepth 1 -delete

ansible/roles/edge-flash-wear/tasks/main.yml

@@ -9,24 +9,6 @@
     name: mmc-utils      # eMMC lifetime/EOL introspection (mmc extcsd read)
     state: present
 
-- name: Ensure the pacman hook directory exists
-  ansible.builtin.file:
-    path: /etc/pacman.d/hooks
-    state: directory
-    mode: "0755"
-
-- name: Empty the pacman package cache after every transaction
-  ansible.builtin.copy:
-    src: edge-pacman-cache.hook
-    dest: /etc/pacman.d/hooks/edge-pacman-cache.hook
-    mode: "0644"
-
-- name: Empty the pacman package cache
-  ansible.builtin.command:
-    argv: [find, /var/cache/pacman/pkg, -mindepth, "1", -delete, -print]
-  register: edge_pacman_cache_clean
-  changed_when: edge_pacman_cache_clean.stdout | length > 0
-
 - name: Ensure journald drop-in directory exists
   ansible.builtin.file:
     path: /etc/systemd/journald.conf.d