feat: add InsAIts PostToolUse security monitoring hook

- Add insaits-security-monitor.py: real-time AI security monitoring
  hook that catches credential exposure, prompt injection,
  hallucinations, and 20+ other anomaly types
- Update hooks.json with InsAIts PostToolUse entry
- Update hooks/README.md with InsAIts in PostToolUse table
- Add InsAIts MCP server entry to mcp-configs/mcp-servers.json

InsAIts (https://github.com/Nomadu27/InsAIts) is an open-source
runtime security layer for multi-agent AI. It runs 100% locally
and writes tamper-evident audit logs to .insaits_audit_session.jsonl.

Install: pip install insa-its

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hooks/hooks.json

@@ -165,6 +165,17 @@
           }
         ],
         "description": "Capture tool use results for continuous learning"
+      },
+      {
+        "matcher": "*",
+        "hooks": [
+          {
+            "type": "command",
+            "command": "python \"${CLAUDE_PLUGIN_ROOT}/scripts/hooks/insaits-security-monitor.py\"",
+            "timeout": 15
+          }
+        ],
+        "description": "InsAIts AI security monitor: catches credential exposure, prompt injection, hallucinations, and 20+ anomaly types. Requires: pip install insa-its"
       }
     ],
     "Stop": [