Add all 23 GoF design pattern implementations (2026-06-13)

03-behavioral/chain-of-responsibility/CriticalIncidentTeam.java

@@ -0,0 +1,15 @@
+package chain;
+
+/** Handles CRITICAL tickets — all-hands incident response */
+public class CriticalIncidentTeam extends SupportHandler {
+
+    @Override
+    protected boolean canHandle(SupportTicket ticket) {
+        return ticket.getPriority() == SupportTicket.Priority.CRITICAL;
+    }
+
+    @Override
+    protected void handle(SupportTicket ticket) {
+        System.out.println("  [CRITICAL TEAM] All-hands war room opened: " + ticket);
+    }
+}