feat: add gitlab-extended MCP server

[PuvaanRaaj]

MCP Server Information

Server Name: gitlab-extended
Repository URL: https://github.com/PuvaanRaaj/gitlab-extended-mcp
Brief Description: Token-efficient GitLab MCP server with 40 tools covering merge requests, issues, pipelines, repository browsing, and project management. Responses are slimmed to essential fields only, diffs are truncated at 150 lines, and system notes are filtered — resulting in 40–60% fewer tokens compared to naive GitLab API proxies.

Basic Requirements

• Open Source: MIT license
• MCP Compliant: Implements MCP API specification via FastMCP
• Active Development: Recent commits and maintained
• Docker Artifact: Dockerfile present (python:3.14-slim base)
• Documentation: README with tool list, setup options, and token-efficiency comparison
• Security Contact: GitHub issues on the repository

Submitter Checklist

• This server meets the basic requirements listed above
• I understand this will undergo automated and manual review.
• I have tested the MCP Server using task validate -- --name gitlab-extended
• I have built the MCP Server using task build -- --tools gitlab-extended
• If the server requires credentials to test it, I have shared test credentials using this form