feat: migrate from SDDM to greetd+tuigreet

- Add greetd role with tuigreet greeter (3 packages, 4.9MB)
- Replace SDDM as display-manager.service with greetd
- Add ADR 0003 documenting migration rationale
- Rename hyprland task: "register session in SDDM" -> "register
  Wayland session desktop entry"
- Add display_manager variables to vars/main.yml
- Add greetd role to workstation.yml
- Update setup.md timestamp

ansible/roles/greetd/handlers/main.yml

@@ -0,0 +1,4 @@
+---
+- name: restart greetd
+  command: systemctl restart greetd
+  become: yes

ansible/roles/greetd/tasks/main.yml

@@ -0,0 +1,28 @@
+---
+- name: Greetd - install packages
+  pacman:
+    name:
+      - "{{ display_manager_package }}"
+      - "{{ display_manager_greeter }}"
+    state: present
+    update_cache: yes
+  tags: [greetd, packages]
+
+- name: Greetd - configure tuigreet to launch Hyprland
+  template:
+    src: config.toml.j2
+    dest: "{{ display_manager_config }}"
+    owner: root
+    group: root
+    mode: '0644'
+  notify: restart greetd
+  tags: [greetd, config]
+
+- name: Greetd - ensure enabled as display manager
+  file:
+    src: /usr/lib/systemd/system/greetd.service
+    dest: /etc/systemd/system/display-manager.service
+    state: link
+    force: yes
+  notify: restart greetd
+  tags: [greetd, service]

ansible/roles/greetd/templates/config.toml.j2

@@ -0,0 +1,8 @@
+[terminal]
+# The VT to run the greeter on
+vt = 1
+
+# Default session: tuigreet greeter
+[default_session]
+command = "tuigreet --time --remember --asterisks --cmd {{ hyprland_cmd | default('Hyprland') }}"
+user = "greeter"

ansible/roles/hyprland/tasks/main.yml

@@ -44,7 +44,7 @@
   notify: rebuild initramfs
   tags: [hyprland, nvidia]
 
-- name: Hyprland - register session in SDDM
+- name: Hyprland - register Wayland session desktop entry
   copy:
     dest: /usr/share/wayland-sessions/hyprland.desktop
     content: |

ansible/vars/main.yml

@@ -65,3 +65,11 @@ hyprland_packages:
   - egl-wayland
   - qt5-wayland
   - qt6-wayland
+
+# ---------------------------------------------------------------------------
+# greetd role: display manager - minimal TUI greeter for Wayland
+# Replaced SDDM (2026-05-20) - see docs/adr/0003-sddm-to-greetd.md
+# ---------------------------------------------------------------------------
+display_manager_package: greetd
+display_manager_greeter: greetd-tuigreet
+display_manager_config: /etc/greetd/config.toml

ansible/workstation.yml

@@ -16,3 +16,5 @@
     - maintenance
     - role: hyprland
       tags: [hyprland]
+    - role: greetd
+      tags: [greetd]