Add GoldRush MCP — blockchain data across 100+ chains

[JayeHarrill]

Adds GoldRush by Covalent — MCP server providing blockchain data across 100+ chains: wallet balances, token prices, transaction history, DEX pairs, and real-time OHLCV streams. npm: @covalenthq/goldrush-mcp-server | Docs: https://goldrush.dev/docs

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Contributor License Agreement

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