[Target] Add Sequential Thinking MCP to the Safety Index

[KryptosAI]

Task

Run MCP Observatory against Sequential Thinking MCP (@anthropic/mcp-server-sequential-thinking) and add a Safety Index target.

Why this matters

Sequential Thinking enables agents to break down complex reasoning into ordered steps with revision. The security surface includes thought chain manipulation, potential for unbounded recursion, and the tool's ability to override or revise prior agent reasoning state.

Steps

1. Run the scan: npx @kryptosai/mcp-observatory test npx -y @anthropic/mcp-server-sequential-thinking
2. Generate the report: npx @kryptosai/mcp-observatory report --run <artifact.json> --format markdown
3. Add artifacts to docs/safety-index/artifacts/sequential-thinking-mcp-server.{json,md}
4. Add entry to docs/safety-index/targets.json
5. Update the safety index table in docs/mcp-server-safety-index.md
6. Run npm run safety-index and npm test

Safe mode

The tool listing works without any configuration. The scan runs in metadata-only safe mode by default.

Reference

See PR #209 (UI5 MCP) for the expected output format. 15-20 minutes.