docs(showcase): add audit log and security commands example to registry

Register the existing audit-log-and-security.md example in the showcase registry
(examples.json) so it appears alongside other CLI tool examples.
Includes 17 audit commands covering list, show, count, and prune
operations with all filter options.

Closes #10824

docs/showcase/examples.json

@@ -68,29 +68,85 @@
       "educational_value": "high",
       "generated_by": "uat-tester",
       "generated_at": "2026-04-07"
+    },
+    {
+      "title": "Audit Log & Security: Tracking Every Security-Relevant Operation",
+      "category": "cli-tools",
+      "path": "cli-tools/audit-log-and-security.md",
+      "feature": "Audit log management and security tracking",
+      "commands": [
+        "agents audit list",
+        "agents audit list --plan plan-abc123",
+        "agents audit list --type plan_applied",
+        "agents audit list --project data-pipeline",
+        "agents audit list --limit 3",
+        "agents audit list --since 2026-03-31T14:43:41",
+        "agents audit show 1",
+        "agents audit show 2",
+        "agents audit show 99999",
+        "agents audit count",
+        "agents audit prune --days 30 --yes",
+        "agents audit prune --days 30",
+        "agents audit prune --days 0",
+        "agents audit --help",
+        "agents audit list --help",
+        "agents audit show --help",
+        "agents audit prune --help"
+      ],
+      "complexity": "intermediate",
+      "educational_value": "high",
+      "generated_by": "uat-tester",
+      "generated_at": "2026-04-07"
     }
   ],
   "categories": {
     "cli-tools": {
       "name": "CLI Tools",
       "description": "Text-based command-line applications",
-      "keywords": ["CLI", "command-line", "terminal", "console", "tool"]
+      "keywords": [
+        "CLI",
+        "command-line",
+        "terminal",
+        "console",
+        "tool"
+      ]
     },
     "api-clients": {
-      "name": "API Clients", 
+      "name": "API Clients",
       "description": "Command-line clients for web APIs",
-      "keywords": ["API", "REST", "client", "HTTP", "web", "request"]
+      "keywords": [
+        "API",
+        "REST",
+        "client",
+        "HTTP",
+        "web",
+        "request"
+      ]
     },
     "data-processing": {
       "name": "Data Processing",
       "description": "Tools for data analysis and transformation",
-      "keywords": ["data", "CSV", "JSON", "parser", "analyzer", "transform"]
+      "keywords": [
+        "data",
+        "CSV",
+        "JSON",
+        "parser",
+        "analyzer",
+        "transform"
+      ]
     },
     "testing-tools": {
       "name": "Testing Tools",
       "description": "Testing utilities and automation",
-      "keywords": ["test", "pytest", "behave", "unittest", "automation", "QA"]
+      "keywords": [
+        "test",
+        "pytest",
+        "behave",
+        "unittest",
+        "automation",
+        "QA"
+      ]
     }
   },
-  "last_updated": "2026-04-07"
+  "last_updated": "2026-04-27"
 }