docs: add spreadsheet-mcp to Built with rmcp#582

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PSU3D0 wants to merge 2 commits intomodelcontextprotocol:mainfrom

PSU3D0:add-spreadsheet-read-mcp

Commits on Dec 10, 2025

docs: add spreadsheet-read-mcp to Built with rmcp
PSU3D0
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Commits on Dec 12, 2025

Update description with repo rename, new features
PSU3D0
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