Initial CV-aligned infrastructure portfolio

Rework portfolio around Linux operations, Zabbix monitoring, migration validation, and ELK/Grafana log observability.

Add AAP-style LVM resize workflow, Zabbix server/proxy/agent automation assets, Linux/AIX monitoring templates, and updated validation CI.

professional-infra/zabbix-monitoring-incident-response/roles/zabbix_agent/tasks/main.yml

@@ -0,0 +1,38 @@
+---
+- name: Validate agent mode
+  ansible.builtin.assert:
+    that:
+      - zabbix_agent_mode in ["active", "passive"]
+    fail_msg: "zabbix_agent_mode must be active or passive"
+
+- name: Create Zabbix agent include directory
+  ansible.builtin.file:
+    path: "{{ zabbix_agent_include_dir }}"
+    state: directory
+    owner: root
+    group: root
+    mode: "0755"
+
+- name: Render Zabbix agent configuration example
+  ansible.builtin.template:
+    src: zabbix_agentd.conf.j2
+    dest: /etc/zabbix/zabbix_agentd.conf
+    owner: root
+    group: root
+    mode: "0644"
+
+- name: Render custom OS check keys
+  ansible.builtin.template:
+    src: os_checks.conf.j2
+    dest: "{{ zabbix_agent_include_dir }}/os_checks.conf"
+    owner: root
+    group: root
+    mode: "0644"
+
+- name: Report agent check model
+  ansible.builtin.debug:
+    msg:
+      host: "{{ zabbix_agent_hostname }}"
+      mode: "{{ zabbix_agent_mode }}"
+      server: "{{ zabbix_agent_server }}"
+      server_active: "{{ zabbix_agent_server_active }}"