Cut the comment bloat from the Podman playbooks

Comment blocks now stay within three lines and explain only the non-obvious. Long histories, include examples, and commented-out code are gone. No task, key, or value changed; the only data change is comment text inside the generated unit files.

audiobookshelf/playbook.yml

@@ -1,31 +1,5 @@
 ---
-# Audiobookshelf as a rootless Podman Quadlet unit, behind the shared Caddy unit
-# (see caddy/playbook.yml).
-#
-# Unlike bitwarden/ and tandoor/, this app has no database to attach: its state
-# is one SQLite file plus files under ~/podman-data/audiobookshelf, so there is
-# no postgres role here and nothing to restore from the shared cluster.
-#
-# Connects as the container user and runs everything as that user: the Quadlet
-# units belong to it, so the connection's PAM session is what makes
-# `systemctl --user` work without any environment juggling.
-#
-# gather_facts is required: podman_user and the home directory come from the
-# user_id / user_dir facts.
-#
-# The rootless-Podman prerequisites (installing podman, enabling lingering, the
-# low-port sysctl, creating the Quadlet directory) are deliberately NOT applied
-# here. They are the shared task file at caddy/roles/podman/tasks/main.yaml, and
-# a host that has already run caddy/playbook.yml has them:
-#
-#   - name: Rootless Podman prerequisites
-#     ansible.builtin.include_tasks: "{{ playbook_dir }}/../caddy/roles/podman/tasks/main.yaml"
-#
-# The variables this play needs are duplicated at the top of vars/default.yml, so
-# it stands on its own. (Applying the commented include above would also need
-# podman_unprivileged_port_start, which lives in caddy/vars/default.yml.)
-#
-# Run with: ansible-playbook -u tanshu audiobookshelf/playbook.yml
+# Requires caddy to have run first. State is SQLite, not Postgres.
 - name: Deploy Audiobookshelf as a rootless Podman Quadlet
   hosts: emily
   gather_facts: true
@@ -33,18 +7,10 @@
     - vars/default.yml
 
   pre_tasks:
-    # This must happen before the app unit is started, not after: the generated
-    # unit references {{ network_name }}.network, and Quadlet fails *unit
-    # generation* (so `systemctl --user start` reports "unit not found") when a
-    # referenced .network file does not exist yet. The same include writes the
-    # Caddy-side drop-in that attaches Caddy to this network.
-    #
-    # network_name is a play var, so the include can see it directly.
+    # Quadlet needs the network unit before it generates the app unit.
     - name: Register Audiobookshelf's network with Caddy
       ansible.builtin.include_tasks: "{{ playbook_dir }}/../caddy/roles/register/tasks/main.yaml"
 
   roles:
-    # The app: the four data directories, the Quadlet unit, start + verify.
     - audiobookshelf
-    # Appends this site's block to the shared Caddyfile and reloads Caddy.
     - caddy