Add reproducible security testing for the SLIM benchmark environment and related test flows.

[muscariello]

Problem

The current test suite focuses on functionality and performance, but it does not provide a clear, isolated path for validating security-related behavior and controls.

Scope

• define dedicated security-oriented test scenarios
• validate security-sensitive paths separately from benchmark and functional test flows
• ensure security tests are reproducible and CI-friendly
• publish security test outputs in a reviewable form

Expected Outcome

• clearer separation between performance and security validation
• repeatable security test coverage for critical paths
• CI visibility into security test results