Create process schema for security workflow adoption

### Feature Description

Design and publish a process schema (diagram + documentation) that guides teams through the adoption of security-related workflows provided by this repository.

### Problem / Opportunity

Teams onboarding to security workflows lack a clear, structured process. A schema reduces confusion, shortens adoption time, and ensures consistent integration across teams.

### Acceptance Criteria

1. A process schema (flowchart or similar) is created and committed to the repository.
2. Schema covers all key decision points: discovery, configuration, testing, and activation.
3. Accompanying documentation or README section explains each step.

### Proposed Solution

Create a Mermaid or another tool related diagram committed under docs/. Add a summary in the README or a dedicated ADOPTION.md.

### Dependencies / Related

_No response_

### Additional Context

_No response_