feat: install wazuh agent in packages role; remove unused deployment files

Wazuh agent:
- packages role now copies the local wazuh-agent RPM to the host, installs
  it via dnf, points /var/ossec/etc/ossec.conf at wazuh.boxswapper.io,
  and enables/starts the wazuh-agent service
- new vars: wazuh_agent_rpm, wazuh_server_address (manager version 4.14.1
  matches the agent RPM)

Cleanup of files not used by the ansible deployment:
- removed wazuh-docker/docker-compose.yml, generate-indexer-certs.yml,
  README.md (role generates certs via podman run, config/ dir is the
  only part referenced)
- removed committed .omo/ session data (already gitignored)

Done by Sisyphus.

roles/packages/tasks/main.yml

@@ -11,3 +11,28 @@
       - fail2ban
       - python3-libdnf5
     state: present
+
+- name: Copy Wazuh agent RPM to host
+  ansible.builtin.copy:
+    src: "{{ playbook_dir }}/{{ wazuh_agent_rpm }}"
+    dest: "/tmp/{{ wazuh_agent_rpm }}"
+    owner: root
+    group: root
+    mode: '0644'
+
+- name: Install Wazuh agent RPM
+  ansible.builtin.dnf:
+    name: "/tmp/{{ wazuh_agent_rpm }}"
+    state: present
+
+- name: Point Wazuh agent at Wazuh manager
+  ansible.builtin.replace:
+    path: /var/ossec/etc/ossec.conf
+    regexp: '<address>MANAGER_IP</address>'
+    replace: '<address>{{ wazuh_server_address }}</address>'
+
+- name: Enable and start Wazuh agent
+  ansible.builtin.systemd:
+    name: wazuh-agent
+    enabled: true
+    state: started