Enable citation analysis tools in MCP server

[turbomam]

Problem

Citation analysis tools are implemented in tools.py but are currently disabled in the MCP server. The following functions exist but are commented out in main.py lines 260-263:

• get_paper_references
• get_paper_citations
• get_citation_network
• find_related_papers

Current State

These tools are:

• ✅ Implemented in src/artl_mcp/tools.py
• ❌ Commented out in src/artl_mcp/main.py
• ❌ Not available via MCP server
• ❌ Not available via CLI

Proposed Solution

1. Uncomment the tool registrations in main.py
2. Test that they work correctly via MCP
3. Update documentation to reflect they are available
4. Add integration tests

Related Issues

Related to citation functionality and may depend on external API availability/reliability.

References

• src/artl_mcp/main.py:260-263 - Commented out registrations
• src/artl_mcp/tools.py:1578-1800 - Tool implementations
• USERS.md - Currently documents these as unavailable