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     style Nodes fill:#212c2a,stroke:#70a99f,stroke-width:1px;
     style PortfolioServices fill:#161d1c,stroke:#415854,stroke-width:2px;
 ```
+
+---
+
+## 🗂️ Documentation Index
+
+*   [**Local Development Setup**](./docs/01-dev-env.md)
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+# 🛠️ Local Development Environment Setup
+
+This document describes how the development workspace is containerized to guarantee identical Ansible and Terraform runtime environments for all operators, regardless of their host OS (Linux, macOS, or Windows).
+
+---
+
+## 🏗️ Dev Container Architecture
+
+The workspace utilizes **VS Code Dev Containers** backed by a custom `Dockerfile` to compile and cache all required configuration and deployment tools.
+
+```mermaid
+graph LR
+    subgraph Workstation ["Developer Workstation"]
+        VSCode["VS Code Editor"]
+        SSHKey["~/.ssh/id_ed25519"]
+    end
+
+    subgraph Container ["Dev Container (Debian Bookworm)"]
+        TF["Terraform CLI 1.5+"]
+        Ansible["Ansible Core"]
+        Nav["Ansible Navigator"]
+    end
+
+    VSCode -->|Mounts Code & SSH| Container
+    Container -->|SSH Keyscan & Sync| Hypervisor["🖥️ Hypervisor (172.30.1.200)"]
+```
+
+---
+
+## 📄 Dockerfile Configuration (`.devcontainer/Dockerfile`)
+
+The container is built from `mcr.microsoft.com/devcontainers/python:1-3.12-bookwork` and executes the following layers:
+
+1.  **System Package Layer**: Updates `apt` caches and installs `curl`, `gnupg`, `git`, `openssh-client`, and `genisoimage`. (Note: `genisoimage` is critical as Terraform uses it to generate custom ISO disks for cloud-init injection).
+2.  **Terraform CLI Layer**: Imports the official Hashicorp GPG key, adds the HashiCorp Debian repository, and installs `terraform` directly.
+3.  **Python / Ansible Layer**: Upgrades `pip` and installs the Python infrastructure tools:
+    *   `ansible`: The automation engine
+    *   `ansible-navigator`: A terminal user interface (TUI) for running and inspecting playbooks.
+    *   `ansible-lint`: A linter to enforce playbook best practices.
+
+---
+
+## ⚙️ Dev Container Settings (`.devcontainer/devcontainer.json`)
+
+*   **Extenstions**: `ms-python.python`, `redhat.ansible`, `hashicorp.terraform`, and `eamodio.gitlens` inside the container.
+*   **SSH Socket Mounting**: Binds the host user's SSH folder:
+
+```json
+"mounts": [
+    "source=${localEnv:HOME}/.ssh,target=/home/vscode/.ssh,type=bind,consistency=cached"
+]
+```
+
+*   **Post-Create Script**: Runs `ssh-keyscan` on the target hypervisor host (`172.30.1.200`) on first load to prevent interactive "unknown host key" prompts during Terraform runs.
+
+---
+
+## 🚀 How to Run the Environment
+
+1.  Open the project root directory in VS Code.
+2.  Open the Command Palette (`Ctrl+Shift+P`) on Linux/Windows, `Cmd+Shift+P` on macOS).
+3.  Type and select: `Dev Containers: Reopen in Container`.
+4.  Once built, verify the toolchains are ready:
+
+```bash
+terraform --version
+ansible --version
+ansible-navigator --version
+```