Add cicada to Third-Party Servers

Description

This PR adds cicada to the third-party servers list.

About cicada

AST-powered code intelligence for Elixir projects with:

• 9 specialized tools for deep code understanding
• AST-aware search - Function definitions with signatures, types, and docs
• Call site tracking - Alias resolution and usage tracking
• PR attribution - Discover which PR introduced any line of code
• Git history - Function evolution, commit tracking, and blame
• Semantic search - NLP-powered keyword extraction for documentation
• Dead code detection - Find potentially unused functions

Performance

Reduces AI query tokens by 82% compared to traditional grep-based approaches (550 vs 3,127 tokens in benchmarks)

Links

• GitHub: https://github.com/wende/cicada
• PyPI: https://pypi.org/project/cicada-mcp/
• Documentation: Comprehensive docs including Quick Start, MCP Tools Reference, and PR Indexing Guide

Checklist

• Added to correct alphabetical position (after Chrome history, before CIViC)
• Concise description following existing format
• Published to PyPI registry (as cicada-mcp)
• Fully functional and tested

Thank you for considering this contribution!