Add lab-02-security-as-a-system

lab-02-security-as-a-system/README.md

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+# Lab 2 — Security as a System
+
+Lab 2 extends the MiniCorp client-router-server environment introduced in Lab 1.
+
+Students investigate the environment to determine what the system is actually doing and use observed evidence to support their conclusions.
+
+## Scenario
+
+The lab reuses the shared MiniCorp client-router-server topology.
+
+Scenario-specific services and assessment behavior are defined within this lab directory.