Add grouping extension implementation with tests and examples#11

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chughtapan wants to merge 4 commits intomodelcontextprotocol:mainfrom

chughtapan:groups/implementation

Commits on Mar 4, 2026

Add grouping extension implementation with tests and examples
chughtapan
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Align tests and examples with reference implementation

chughtapan
and
claude
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Commits on Mar 5, 2026

Fix package-lock.json name to match package.json

chughtapan
and
claude
committed
Use extensions capability, add prompt grouping

chughtapan
and
claude
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