Add ClawSec and ClawSearch - Security for agentic AI skills

[huacheng]

Summary

Adds ClawSec and ClawSearch to the Tools section.

• ClawSec - Security audit platform for AI agent skills with 5-tier analysis including static, dynamic, behavioral, Firecracker sandbox execution, and LLM-assisted review.
• ClawSearch - Search engine for AI agent skills with security-first indexing, surfacing audit results, risk scores, and safe alternatives for MCP servers and agent tools.

Entries added alphabetically following the existing format.