Define ALM Flow and Environment Strategy

### What is it?
Design an environment strategy for managing MCS+AI infrastructure across dev, test, and prod. This should include guidance on workspaces, environment tagging, deployment flow, and configuration scoping.

### Definition of Done
- Terraform or deployment layer strategy outlined (e.g., separate states/workspaces)
- Clear flow defined for dev → test → prod
- Notes on security/isolation and promotion strategies

### Value Provided
Gives users an architectural foundation for managing multiple environments with confidence.

Part of #22