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.

docs/runbooks.md

@@ -0,0 +1,92 @@
+# Portfolio Runbooks
+
+These runbooks are scoped to the portfolio version of the projects. They favor fast validation and reviewable evidence over full production operations.
+
+## Linux Operations Automation
+
+Validate the implemented Ansible core:
+
+```bash
+cd professional-infra/linux-operations-automation
+make test
+```
+
+Run a safe failure simulation without live SSH hosts:
+
+```bash
+make demo
+```
+
+Review the AAP-style LVM workflow:
+
+```bash
+ansible-playbook -i inventory/hosts.ini playbooks/lvm_resize.yml --syntax-check
+cat docs/aap_lvm_resize_workflow.md
+```
+
+Run playbooks against your own lab hosts after updating `inventory/hosts.ini`:
+
+```bash
+make run
+make patch
+make harden
+make decommission
+```
+
+## Zabbix Monitoring + Incident Response
+
+Validate Zabbix playbooks and templates:
+
+```bash
+cd professional-infra/zabbix-monitoring-incident-response
+make test
+```
+
+Review proxy and OS monitoring operations:
+
+```bash
+cat docs/proxy-design.md
+cat docs/maintenance-runbook.md
+cat docs/incident-response-runbook.md
+```
+
+Linux and AIX checks are represented as templates and sample data. AIX is not run locally.
+
+## Migration Validation Framework
+
+Validate code and parser/report behavior:
+
+```bash
+cd professional-infra/migration-validation-framework
+make test
+```
+
+Run the included before/after comparison:
+
+```bash
+make demo
+```
+
+The demo intentionally reports `FAIL` to show a high-risk migration finding.
+
+## Log Observability ELK/Grafana
+
+Validate Docker Compose and required bind-mounted configs:
+
+```bash
+cd professional-infra/log-observability-elk-grafana
+make test
+```
+
+Generate sample incident logs without starting the full stack:
+
+```bash
+make demo
+```
+
+Start the full local demo stack with Docker:
+
+```bash
+make run
+make down
+```