[Documentation] Add Stage Output Diagrams to READMEs

## Description of Documentation Need
The core FAST foundation stages currently lack visual architecture diagrams showing the expected outputs for each deployment stage.

## Target Audience
Developers, Architects, and Security Auditors.

## Proposed Location
The respective `README.md` files within `fast/stages-aw/`.

## Content Outline / Draft
Embed an SVG or PNG diagram at the top of each README illustrating the project hierarchy, networks, and resources generated by that specific stage.

## Compliance Context (if applicable)
Helps satisfy architecture documentation requirements.

## Additional Context
This was explicitly requested in the legacy Feature Braindump from 2023.