feat: Add comprehensive enterprise Linux infrastructure portfolio with Ansible, Python, and ELK stack

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+# Enterprise Infrastructure Portfolio
+
+This mono-repository showcases enterprise-level Linux infrastructure engineering capabilities through three comprehensive projects demonstrating DevOps and Platform Engineering best practices.
+
+## Projects Overview
+
+### 1. Enterprise Infrastructure Simulator
+A container-based simulation of enterprise Linux infrastructure with Ansible automation for provisioning, patching, hardening, and decommissioning operations. Includes failure simulation and scaling scenarios.
+
+**Key Features:**
+- Multi-node Linux simulation using Docker containers
+- Ansible playbooks for infrastructure lifecycle management
+- Automated scaling and failure injection scripts
+- Enterprise-grade inventory and scenario management
+
+### 2. Migration Validation Framework
+A Python CLI tool for validating system migrations by collecting, comparing, and reporting on system state changes. Generates comprehensive before/after snapshots and HTML reports.
+
+**Key Features:**
+- Automated system data collection (mounts, services, disk usage)
+- JSON snapshot generation and comparison
+- HTML report generation with change visualization
+- CLI interface for enterprise migration workflows
+
+### 3. Observability Stack
+A complete monitoring and logging stack using ELK (Elasticsearch, Logstash, Kibana) and Grafana for comprehensive infrastructure observability.
+
+**Key Features:**
+- Docker Compose deployment of full observability stack
+- Sample log ingestion and processing pipelines
+- Alerting rules and incident simulation scenarios
+- Real-time dashboards and monitoring capabilities
+
+## Architecture
+
+See [docs/architecture.md](docs/architecture.md) for detailed architecture overview.
+
+## Runbooks
+
+Operational procedures and troubleshooting guides available in [docs/runbooks.md](docs/runbooks.md).
+
+## Getting Started
+
+Each project contains its own README.md with setup and usage instructions.
+
+## CI/CD
+
+Automated testing and linting via Gitea workflows in [.gitea/workflows/](.gitea/workflows/).
+
+## Prerequisites
+
+- Docker and Docker Compose
+- Ansible
+- Python 3.8+
+- Make
+
+## License
+
+Enterprise Internal Use Only