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.

tandoor/roles/postgres/tasks/main.yaml

@@ -1,26 +1,7 @@
 ---
-# Attach this app's network to the shared Postgres unit.
-#
-# Postgres knows nothing about its clients, exactly like Caddy: a service joins
-# by dropping 50-tandoor.conf and the shared 10-network-aliases.conf next to
-# postgres.container. The canonical way to do that is the shared include below —
-# it writes the same bytes every service writes, asserts that tandoor.network
-# already exists, and notifies the "Restart Postgres" handler defined in this
-# role.
-#
-# This runs in the roles phase, which is after the register include in
-# playbook.yml's pre_tasks has created tandoor.network.
-
 - name: Attach Tandoor to Postgres
   ansible.builtin.include_tasks: "{{ playbook_dir }}/../postgres/roles/attach/tasks/main.yaml"
 
-# On a first attach both drop-ins are new, so Postgres has to be recreated to
-# join tandoor_net — and that restart is a *handler*, which by default runs at
-# the end of the play, after the tandoor role has already started the app. The
-# app would then come up before `db` resolves, fail its own is-active check, and
-# fail the play on a machine where nothing is actually wrong.
-#
-# Flushing applies the new drop-in before the app starts. On later runs the
-# drop-ins are unchanged, nothing is pending, and this is a no-op.
+# The restart that joins Postgres to tandoor_net is a handler, so flush it before the app starts or its is-active check fails.
 - name: Apply the Postgres network change before starting Tandoor
   ansible.builtin.meta: flush_handlers