docs(security): update threat-db v2.2.0 — CVE-2026-0755, mcp-run-python SSRF, 5 new scanners
New CVEs:
- CVE-2026-0755 (gemini-mcp-tool, CVSS 9.8, RCE, no fix yet)
- SNYK-PYTHON-MCPRUNPYTHON-15250607 (mcp-run-python SSRF via Deno sandbox)
New entries:
- Attack technique T010: Agent-to-Agent Communication Injection
- 5 new scanning tools: Proximity, Enkrypt AI, Cisco MCP Scanner, NeuralTrust, MCPScan.ai
- 1 new defensive resource: Anthropic Claude Code Security (2026-02-21)
- 4 new sources (Lakera, Penligent AI, Snyk, THN)
Updated security-hardening.md: added CVE-2026-0755 and mcp-run-python SSRF to CVE table
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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