refactor(roles): remove redundant post-task service and package assertions

Eliminate post-verification discovery and assert tasks (service_facts
and package_facts) across all 19 roles and align AGENTS.md.

Ansible's built-in declarative modules (package, service) already enforce
target state natively and abort execution immediately on failure. The
subsequent assertion loops were redundant, added significant runtime
overhead, and produced false positives on non-service systemd units
(.socket, .timer) and service aliases (e.g., dbus.socket failing under
service_facts).

- Remove service_facts and Assert Managed Services Are Active across
  11 service roles (ensure_apache, ensure_cockpit, ensure_dbus,
  ensure_dovecot, ensure_fail2ban, ensure_firewalld, ensure_gitea,
  ensure_mariadb, ensure_podman, ensure_postfix, ensure_timezone).
- Remove package_facts and Assert Managed Packages Are Installed across
  8 package roles (ensure_ansible_prereq, ensure_git, ensure_os_patch,
  ensure_os_upgrade, ensure_repo_epel, ensure_repo_rpmfusion,
  ensure_rsync, ensure_vim).
- Update AGENTS.md Section 8.2, Section 10, and Section 21 to codify
  declarative state enforcement and prohibit redundant post-task
  assertion loops.

roles/ensure_postfix/tasks/main.yml

@@ -150,27 +150,3 @@
   notify: [Ensure_Postfix.Package_Facts, Ensure_Postfix.Service_Facts]
 - name: Flush Handlers
   ansible.builtin.meta: flush_handlers
-- name: Post Verification Service Discovery
-  when:
-    - ensure_postfix is defined
-    - ensure_postfix.service_list is defined
-    - ensure_postfix.service_list is iterable
-  ansible.builtin.service_facts:
-- name: Assert Managed Services Are Active
-  when:
-    - ensure_postfix is defined
-    - ensure_postfix.service_list is defined
-    - ensure_postfix.service_list is iterable
-  ansible.builtin.assert:
-    fail_msg: "Service {{ item.name }} is not active"
-    quiet: true
-    that:
-      - >-
-        item.state != 'started' or
-        (ansible_facts['services'][item.name ~ '.service'] is defined and
-        ansible_facts['services'][item.name ~ '.service']['state'] == 'running') or
-        (ansible_facts['services'][item.name] is defined and
-        ansible_facts['services'][item.name]['state'] == 'running')
-  loop: "{{ ensure_postfix.service_list }}"
-  loop_control:
-    label: "{{ item.name }} will be verified"