feat: implement live LocalStack Azure exploit execution

[Ker102]

Goal

Move the Azure public Blob demo from offline simulation to live LocalStack Azure exploit execution.

Acceptance Criteria

• nullstate sandbox up localstack-azure starts the backend reliably
• Terraform deploys the vulnerable fixture into LocalStack Azure
• red-team attack performs a real anonymous blob read against the emulator
• remediation is applied in the run workspace
• second attack is blocked
• report includes live exploit evidence

Technical Notes

Keep all execution local and require LOCALSTACK_AUTH_TOKEN through environment variables only.