fix: shorten server.json description for MCP Registry

[johnxie]

Summary

• Shortens server.json description from 126 to 88 characters
• MCP Registry validation requires description to be ≤ 100 characters
• Unblocks publishing to registry.modelcontextprotocol.io via mcp-publisher

🤖 Generated with Claude Code

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Latest commit: 7ef29f2

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